Tag Archives: Birdwatching

Mother Nature’s whims can produce major impacts on birds

Sooty_tern_flying

Photo by U.S. Fish and Wildlife Service/Duncan Wright The sooty tern, pictured, nests mainly in Hawaii, but some also nest on the islands of the Dry Tortugas, west of the Florida Keys. In 2004, Hurricane Frances blew one of these tropical birds to Holston Lake in Bristol. Severe storms also present devastating obstacles for other birds.

With Hurricane Florence dominating the headlines in recent weeks, it’s only natural to speculate on whether such storms can impact birds in a negative way.

According to a 2011 blog post made on the National Wildlife Federation website, hurricanes can be bad news for some birds. Naturally enough, sea birds and waterfowl are most exposed to the forces of a hurricane. Some birds will move inland to avoid the incoming storm. The birds that inhabit our yards and gardens will ride out the storm using special adaptations. Songbirds will automatically tighten their toes around their perches, riding out the winds of a hurricane by holding onto a branch with a death grip. It’s the same adaptation that lets them sleep on a branch without letting go and falling off during the night.

The blog points out that the news often covers the appearance of rare species after a major storm. Some of these birds transported to unusual locations are probably younger or weaker birds. Once transported far from their usual range by a hurricane, it can take weeks to return home — if they can find the right foods on their way back.

John-James-Audubon-Bachman_s-Swamp-Warbler.-1.-Male.-2.-Female.-Gordonia-pubescens.- (1)

Early naturalist and accomplished artist John James Audubon painted Bachman’s warbler without ever seeing a living one. A friend sent him some skins of the warbler collected near Charleston, South Carolina. A hurricane may have contributed to the extinction of Bachman’s warbler.

In a worst case scenario, hurricanes may have dealt fatal blows to some bird species. For instance, a hurricane may have delivered the knock-out blow to a species of warbler that went extinct last century, according to the website, Field Guide to Extinct Birds. A hurricane that slammed into Cuba in the 1930s when most of the Bachman’s warbler population was wintering on the island might have wiped out enough of the population to make the survivors too rare and far-flung to find each other to breed. The warbler, sensitive to habitat destruction from logging and already in a steep decline, never seemed to recover. It was the ultimate example of keeping all of one’s eggs — or birds — in one unlucky basket.

Discovered in 1832 near Charleston, South Carolina, by the Reverend John Bachman, this warbler attracted little attention for the first half century after its discovery. Bachman sent some skins of the bird to his friend, the artist and early naturalist John James Audubon. Subsequently, Audubon painted this warbler by using those skins and Bachman’s description of the bird’s habits for inspiration. Ironically, considering he described the species for science, Audubon never actually laid eyes on an actual living Bachman’s warbler.

The last specimens of Bachman’s warbler were collected in Mississippi in the early 1940s. The last strongholds for breeding Bachman’s warblers in the United States were Fairfax County, Virginia, in the 1950s and South Carolina’s I’on Swamp in the early 1960s. The last photograph documenting a Bachman’s warbler was taken in 1954. in Charleston, South Carolina, bringing the story of this warbler full circle from its discovery in the same vicinity back in 1832. No Bachman’s warbler sightings have been confirmed since 1961, despite reports in the 1970s and 1980s, as well as reports made in the spring of 2000 and 2001 in the Congaree Swamp National Monument in Richland County, South Carolina. None of those sightings could be confirmed.

Like the ivory-billed woodpecker and Eskimo curlew, Bachman’s warbler is another bird likely to be labeled for the near future with the tag “likely extinct” associated with its name. Like the large woodpecker and the shorebird with a penchant for long-distance migration, the Bachman’s warbler went out with a whimper, not a bang, with most of its viable population snuffed out by an October hurricane just as the species returned to Cuba for the winter season.

Ruby-throat

Photo by Bryan Stevens • Ruby-throated Hummingbirds make a non-stop crossing of the Gulf of Mexico. A hurricane in the Gulf during migration could have serious consequences for this small bird.

More recently, experts worried Hurricane Irma might have delivered a knockout blow to the population of another tiny species of warbler. The Barbuda warblers on the tiny Caribbean island of Barbuda were feared exterminated in the wake of Irma. When the storm hit the island in September of 2017, its path affected more than 90 percent of the island and nearly wiped out the available habitat for the warbler, which already had a Near Threatened status. After the passage of the storm, participants in searches for the warbler turned up sightings of the bird. Nevertheless, the population status and ability to fully recover remains uncertain.

Science keeps adding to its knowledge of how birds are affected by hurricanes and other storms. A 2017 study showed possible consequences for a seabird known as the sooty tern in relation to hurricanes.

The study, published in the peer-reviewed open-access journal PeerJ, is the first to map the birds’ annual migratory path and demonstrate how its timing and trajectory place them in the direct path of hurricanes moving into the Caribbean after forming over the Atlantic.

Climate change threatens to bring about more frequent and powerful hurricanes, which could be bad news for the terns. Migration is a stressful undertaking for birds. If they encounter a strong storm in a weakened state, the results could be catastrophic. The study revealed a strong relationship between the numbers and locations of bird deaths and the numbers and locations of hurricanes. The study also showed that it isn’t just monster storms with the potential to cause devastation. Tropical Storm Delia, a small storm in the Gulf of Mexico in 1973, killed a lot of sooty terns. Essentially, the terns were in the wrong place at the wrong time.

Shorebirds

Photo by Bryan Stevens • A mixed flock of Short-billed and Long-billed Dowitchers and a Ruddy Turnstone at Huntington Beach State Park in South Carolina. Hurricanes can interrupt the migrations of even these long-distance migrants.

Of course, the sooty tern is not a rare bird. About 80,000 or more of these terns are estimated to breed in the Dry Tortugas each year. That’s the entire point, however; Bachman’s warbler was also once considered a common bird.

All of these examples point to the resilience of birds, but there’s also a lesson to learn. We should never take any of our feathered friends for granted. While the winds and rains from a hurricane can decimate human lives, wildlife is not immune. Sadly, birds can weather many a storm, but sometimes they get swamped.

 

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Meadowlarks fond of grassland habitats

Jean-MeadowlarkPhoto by Jean Potter • A rocky outcrop provides a perch for this singing male Eastern meadowlark.

 

It’s always fun to add another notch to one’s list of birds. Whether you’re a casual lister or a devoted birder, a new species always offers a burst of excitement in the wake of a first-time observation.

Sharon Foster sent me an email recently to share her excitement about a sighting.

“I’m excited to say my daughter and I spotted a meadowlark up on Cross Mountain last week,” Sharon wrote in her email.

Sharon said she hadn’t been able to do a lot of bird watching other than in her yard and nearby places.

“I never thought I was going to see a meadowlark,” she noted. They are fantastic. We were thrilled. He was just sitting on the fence.’

She added that she didn’t have her good zoom camera with her, or else she could have taken a picture. She will still have her memory of her first sighting, and that’s what is important.

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Photo by USFWS • Baltimore orioles, like this male, are members of the blackbird family, making them relatives of species such as Eastern meadowlarks, brown-headed cowbirds, common grackles and red-winged blackbirds.

She also told me about a Baltimore oriole feeder she bought last fall late in the season.

“I read they usually come around early in spring,” Sharon wrote. She added that she spotted one in her yard by South Holston Lake several years ago.

Of course, when spring rolled around she nearly forgot about the feeder. “It was around mid-April when I thought about it and thought it was too late,” she wrote. “But I put it up anyway and lo and behold the next day there was an oriole in our pine tree.”

It was another memorable birding moment. “Talk about being excited,” Sharon wrote. “Wow! Birds can do that to you!”

WesternMeadowlark

Both the Baltimore oriole and the Eastern meadowlark belong to the family of birds known as icterids, or blackbirds, which also includes species like bobolink, brown-headed cowbird, common grackle and red-winged blackbird.

The Eastern meadowlark is a distinctive bird. It has brown plumage accented by black, with bright-yellow underparts and a bold black V across the chest. Though most of the tail is brown with blackish barring, the outer feathers are white and are a conspicuous trait to look for when the bird is in flight.

The Eastern meadowlark is considered a grassland bird and remains common in habitats such as prairies and other native grasslands. The meadowlark has proven adaptable as long as it can occupy unbroken grassland of about six acres or more. Pastures, fields and even airports have proven suitable habitats for meadowlarks. As suburban areas and subdivisions expand into rural areas, meadowlarks can hang on unless the grassland habitat becomes too segmented and broken into sections too small to be of value.

Meadowlark-USFWS

Photo by Peter Pearsall/USFWS • Eastern meadowlarks spend a lot of time on the ground while searching for insects.

Meadowlarks eat mostly insects, especially in summer. For the winter months, these birds will adapt their diet to include seeds, spilled corn and fruit. Meadowlarks, unlike other relatives among the Icterids, or blackbirds, do not typically visit feeders.

These birds construct nests close to the ground. Meadowlarks nesting in fields mown for hay face disaster if the grass is cut before their young have left the nest. The female meadowlark constructs the nest and lays two to seven eggs, which will require an incubation period of about two weeks. Even after hatching, the young are not capable of leaving the nest for another 10 to 12 days. Consequently, young meadowlarks are vulnerable for a month, not only to predators but to a farmer deciding to mow a hayfield.

While the Eastern meadowlark remains common, its numbers have suffered severe declines. such that they are considered to be a declining species. Populations fell more than 3 percent a year between 1966 and 2015, resulting in a cumulative decline of 89 percent, according to the North American Breeding Bird Survey. According to the website All About Birds, early mowing, overgrazing by livestock and pesticide use are all detrimental to meadowlark survival.

The highest population densities for the Eastern meadowlark are found in the Central Mixed Grass Prairie and the Eastern Tallgrass Prairie regions of the central United States. As the name suggests, the Eastern meadowlark has a counterpart in the western half of the United States. This is reflected in the fact that five central and western states — Kansas, Montana, Nebraska, North Dakota, Oregon and Wyoming — have made the Western meadowlark their official state bird. Ironically, the Eastern meadowlark has not been honored with that designation by any of the states it inhabits.

The difference in the two species rests not so much in their appearance as in their songs. The western meadowlark has distinctive vocalizations described as rather flute-like, which distinguish it from the closely related eastern meadowlark. Male Eastern meadowlarks seek out elevated perches to produce a musical, flute-like song in the spring. Utility wires, treetops and fence posts provide some of their favorite perches. Their singing is mostly used to define the borders of their grassland territory.

Finally getting your binoculars on a bird you’ve never seen is always an exciting moment. As we draw closer to the fall season, many different birds will migrate through the region. Fall migration is a great time to spend some time outdoors and try to see some birds that are new. Do some advance homework with a good field guide and study the birds that migrate through the region. Then, simply monitor your yard or a favorite park and wait to see some new species as they make migratory stops in the region.

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Early American naturalist and painter John James Audubon painting this scene depicting nesting meadowlarks.

Family of pigeons, doves features one famous member

Vivian Tester of Bristol, Tennessee, sent me an email seeking help with a pigeon problem.

“I need your advice on trying to keep the pigeons off my bird feeders,” Vivian wrote. “They are chasing off the birds I want to feed and devouring all the seed. My neighbor says they are doves but whatever they are, they are annoying. I don’t know if the squirrel-proof feeder would work or not. I would appreciate any help.”

animal animal photography avian beak

Photo of a rock pigeon by Pixabay on Pexels.com

I recommended that Vivian offer only black oil sunflower seeds to see if that might can discourage the unwanted guests. While pigeons will eat sunflower seeds, they much prefer smaller seeds like milo and millet often found in mixed seed packages. If their preferred food source dries up, they may be convinced to move elsewhere.

Stopping feeding for a trial period is another possibility. Remove food for a week and then slowly start offering seeds again. If the pigeons have moved to other feeding grounds, perhaps they will be slow to return.

It’s a tough problem to solve. Although some feeders can be designed to prevent a large bird like a pigeon or dove from perching, the birds are going to still make the attempt. In doing so, they knock seed to the ground below and will happily feed on the spillage. The best option for avoiding pigeons would be to use tube feeders designed for minimal spillage if jostled. Doves and pigeons prefer to feed on the ground, so scattering seeds there, intentionally or inadvertently, is an invitation for flocks to gather.

PIGEON-PIC

Photo by Jean Potter • The widespread rock pigeon is one of the most successful members of the bird family Columbidae, which is comprised of some 310 species of doves and pigeons. One of the most famous representatives of the family is the dodo, an extinct relative of such common birds as the mourning dove and rock pigeon.

Nature, too, offers a solution. Several species of raptors prey readily on doves and pigeons. Peregrine falcons and Cooper’s hawks are two effective controls on such birds, but it is not easy to issue an invitation for one of these birds to take up residence in your yard.

The two mostly likely offenders in the region are the mourning dove and the rock pigeon. Mourning doves are an abundant native species at home in both rural areas and suburbs. The rock pigeon is not a native species but has thrived in the United States since it first arrived with early colonists from Europe. Rock pigeons are mostly a problem for people attempting to feed birds in urban and suburban areas.

Pigeons and doves constitute the animal family Columbidae, which is comprised of some 310 species. One of the most famous members of this family is the extinct bird known as the dodo. The well-known story of the dodo doesn’t often make reference to the relations this bird had to living doves and pigeons.

Roelant_Savery_-_Landscape_with_Birds_-_WGA20885 2

In the lower right corner of this illustration, a dodo is visible along with such birds                        as macaws, cranes, and even a wild turkey. Titled “Landscape with Birds,” this painting            was done by artist Roelant Savery in 1628.

Early scientists did not know what to make of the dodo and theorized that the unusual flightless bird was everything from a small ostrich to flightless versions of an albatross or a vulture. Johannes Theodor Reinhardt, a zoologist from Denmark, hinted at the dodo’s relationship to the world’s pigeons and doves as early as 1842. At first his theory was ridiculed, but other biologists and zoologists eventually came to accept the fact that the dodo was indeed a large, flightless pigeon.

The dodo stood a few inches over three feet tall and could weigh close to 40 pounds. Most of what is known about the dodo comes from paintings and drawings of the bird made by early explorers in the 17th century. Some of the humans who observed the bird also left behind valuable written accounts. First discovered by Dutch sailors who visited the Indian Ocean island of Mauritius in 1598, the dodo became extinct only 64 years later. So about the same time the rock pigeon was establishing itself as an introduced species of bird in North America, around the world one of its cousins slid quietly into extinction.800px-Van_den_Venne_dodo 2

The dodo has acquired a reputation in popular culture as slow-witted, lethargic, fat, clumsy and stupid, dooming the bird as a creature too ill-suited to exist. Today, most scientists believe that the dodo was adapted perfectly to its island habitat. Having evolved as a flightless bird, the arrival of humans in its paradise meant its doom. The reputation for stupidity is unfair. Having never encountered humans, dodos did not have an instinctive fear of them. This lack of fear made it easy for the early explorers of their island home to quickly render them extinct.

Modern science has even pinpointed the dodo’s closest living relative. Thanks to DNA analysis, the Nicobar pigeon of southeast Asia has been identified as the closest relation of the dodo. The Nicobar pigeon is much smaller (only 16 inches long) and, unlike its famous relative, is capable of flight. This pigeon feeds mostly on fruit and seed. When grain of any kind is available, it will also make use of such a food source.

Most contemporary sources reveal that the dodo enjoyed a diet rich in fruit, but modern biologists speculate the dodo probably also foraged for nuts, seeds and tubers. It’s ironic that the dodos were slaughtered to extinction to provide food for early explorers of their island. An English explorer by the name of Sir Thomas Herbert recognized the dodo’s exploitation as a food source, but disparaged the bird’s taste. “To the delicate they are offensive and of no nourishment,” Herbert wrote in his published work, “A Relation of Some Years Travel into Africa and the Greater Asia.”

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This sketch, completed in 1634 by Sir Thomas Herbert, shows a broad-billed parrot, a red rail and possibly one of the last dodos to exist on the planet. Herbert described the dodo as a rather poor food source for early explorers to its island home. 

Like the pigeons that have become a scourge on Vivian’s feeders, it’s very likely that, had they survived, dodos might visit feeders today on the island of Mauritius. For the most part, the world’s doves and pigeons are considered successful birds.

In the United States, some other native doves include the widespread mourning dove, as well as white-winged dove, common ground dove and Inca dove. The Eurasian collared-dove, introduced into the Bahamas and Florida, has now spread extensively into the United States and is known to have established populations through northeast Tennessee and southwest Virginia.

Dove-Wing

Photo by Bryan Stevens • A mourning dove stretches a wing while perched on a feeder.

Some descriptive names for some of the world’s doves include purple-winged ground dove, lemon dove, zebra dove, ochre-bellied dove, tambourine dove, white-faced cuckoo-dove, ring-necked dove, little cuckoo-dove and sapphire quail-dove. Pigeons have also been bestowed with such colorful names as snow pigeon, speckled pigeon, yellow-eyed pigeon, pale-capped pigeon, metallic pigeon, crested pigeon, pink pigeon and squatter pigeon.

We all like to attract as many birds as possible to our yards and gardens. A variety of food will help achieve that objective. Be aware, though, that such free buffets will also encourage messy birds like pigeons that make feathered pigs of themselves and almost always overstay their welcome. There’s also the option to admire pigeons and doves as survivors with a lineage worthy of some admiration. Hang some tube feeders accessible to smaller songbirds but toss some seeds into a corner of the yard for the ground-feeding pigeons and doves. They’re birds, too, after all.

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English naturalists dissected a dodo skull, shown in this sketch, in 1848 to help prove the relationship of the dodo to pigeons.

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Indigo bunting one of summer’s common songbirds

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Photo by Bryan Stevens • The male indigo bunting is a resplendent bird.

Two recent summer bird counts emphasized some of the more commonplace birds in the region. While American robins and European starlings were extremely abundant, these two birds are permanent residents and are present year-round. A few other summer songbirds also helped swell the ranks of some of the seasonally common birds. For instance, the Unicoi County Summer Bird Count found a total of 141 indigo buntings while the Elizabethton Summer Bird Count tallied 82 of these little blue beauties. Both of these Northeast Tennessee surveys are conducted by members of the Lee and Lois Herndon Chapter of Tennessee Ornithological Society.

The indigo bunting likes to reside in the boundary region where forests and woodlands meet fields and pastures. Personally, the indigo bunting has always been a bird that is suggestive of the long, hot days of summer. One of my earliest and still quite vivid birding memories is a recollection of a shockingly blue bird atop a blue spruce tree in my yard. Several decades later, the tree is no longer standing, but these beautiful birds — I now know these summer visitors were indigo buntings — return year after year to my yard and gardens.

Count-IndigoBunting

Photo by Bryan Stevens • Neotropical migrants, such as this Indigo Bunting, increase the variety of bright and colorful birds in eastern North America from spring until fall each year.

These birds usually arrive in the region in late April and I’ve seen them in late October, although most indigo buntings have left the region by late September.

Male indigo buntings are persistent singers, and in the past couple of weeks one very enthusiastic male has been singing even during the hottest hours of recent July afternoons. The preference of this small songbird is to sing from the tops of tall trees. They are often concealed by the green leaves. When I do get a glimpse of the obscured songster, often all I see is a dark shape silhouetted against the bright sky. Sometimes, if he plunges from the upper branches into the woodland understory, I get that telltale glimpse of blue feathers.

The indigo bunting is the only solid blue bird in the eastern United States. It’s all an illusion, of course. The indigo bunting’s feathers are not really blue. The male’s brilliant azure plumage is caused by the process of refraction. This process absorbs all but blue light, which explains why the indigo bunting appears blue. In bright light, it can even look unnaturally vivid blue. In poor light, however, an indigo bunting male can appear black. Fortunately, indigo buntings have both a characteristic body shape and song, so even if the birds are not seen at their best, they can still be recognized.

Indigo-Count

Photon by Bryan Stevens • Indigo Buntings will perch on wires and sing for hours even during hot summer days.

Like many species of songbirds, the male is by far the most colorful. In this instance, the male is also responsible for the species’ name. Indigo is a blue dye that was once an important crop in the South. The drab female may boast some blue highlights in her plumage. Juvenile birds just out of the nest also resemble the female. Pay close attention to any indigo buntings you observe as summer progresses. Juvenile birds will look mostly brown with just a hint of blue in the wings and the tail. These will be the young buntings that were hatched this spring and early summer. They will often accompany their parents to feeders.

Indigo buntings are particularly fun birds to observe in late summer. Although some books indicate that males are not very active in rearing young, I have on numerous occasions witnessed male buntings feeding fledglings at feeders. Indigo bunting juveniles, like the young of many other birds, beg for tidbits from parents by “bowing,” spreading their wings and shivering. These actions usually prompt a parent to pop some morsel into an impatient youngster’s open bill. Indigo buntings are relatively easy to view. They frequent weedy fields and roadside brush. During the breeding season, males can also be seen singing from prominent perches. The song, a distinctive jumble of notes, can help observers find these dedicated singers.

IndigoBunt

Photo by Bryan Stevens • Although bright blue, a male indigo bunting will often blend with its surroundings.

The male indigo bunting is one of the most colorful birds to visit feeders in the region. This species is also extremely fond of millet seed. I like to have some feeders stocked with millet when the buntings begin to return each spring. They will also feed on thistle and sunflower seeds. Away from our feeders, they also devour plenty of seeds from various noxious weeds. Because of the indigo bunting’s appetite for the seeds of destructive weeds, it is considered a very beneficial bird.

One of the most attractive summer scenes is to observe American goldfinches and indigo buntings feeding together on the nodding heads of summer sunflowers. The goldfinch males, resplendent in their bright yellow and black plumage, compete with the blue indigo bunting males for the fresh sunflower seeds. When bright red male Northern cardinals join in, observers have a complete artists’s palette for summer viewing.

The indigo bunting will usually respond to human squeaks that imitate a bird’s call. When a flock or family group of buntings are disturbed by a human observer, they usually begin a chorus of alarmed “chipping.”indigo-bunting-john-james-audubon

As I indicated earlier, indigo buntings remain in the region until late September. Although this bird typically winters in Mexico, Panama and the Caribbean, in recent decades some indigo buntings have only gone as far south as Florida to spend the winter. There in the Sunshine State, the indigo buntings may mingle with a close relative, the splendidly multi-colored painted bunting. I usually see these vibrant songbirds whenever I visit coastal South Carolina in spring or summer. Male painted buntings are probably one of the most colorful birds in the United States with hues of red, green, purple and blue in their feathers.

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Photo by Bryan Stevens • The male painted bunting is one of North America’s most colorful birds.

Other North American buntings include the snow bunting, the lazuli bunting and the lark bunting, which is also the official state bird for Colorado. Some of the common but descriptive names for some of the world’s other buntings include striolated bunting, cinnamon-breasted bunting, cinereous bunting, white-capped bunting, lark-like bunting, ochre-rumped bunting, golden-breasted bunting, chestnut-bunting, red-headed bunting, yellow bunting, little bunting, brown-rumped bunting, meadow bunting, corn bunting and crested bunting.

Keep your feeders stocked with millet and sunflower seeds if you want to increase your chances of seeing indigo buntings. They will need some dependable places to re-fuel and rest during their upcoming fall migration.

Reader’s mystery bird turns out to be Louisiana waterthrush

On occasion, readers seek out my help with identifying birds they encounter. I am always glad to assist. Photographs, a recording of the bird’s song, or even a well-written description are often all that’s necessary to pinpoint the identities of mystery birds.

Lewis and Jeana Chapman, residents of Laurel Bloomery, Tennessee, notified me in an email that they have been enjoying some good birdwatching trips. They also wanted some help with the identity of a bird they observed last summer.

NoWaterthrush

Photo by Bryan Stevens • The Northern waterthrush, pictured, has a beige eye line rather than the white one usually shown by the Louisiana waterthrush.

“My wife and I love to go to the Creeper Trail in Virginia and enjoy the creek,” Lewis wrote in an email. “On these trips in the summer months, we have watched this bird run along the rocks of the shore feeding.”

He also mentioned that he had attached in his email some photos, which proved extremely helpful. “Our closest guess at what type of bird it is was a spotted sandpiper, but its beak/bill seems too short. Any help you can give us would be greatly appreciated.”

A quick scan of the photos the Chapmans sent with their email helped me narrow the options down to two related birds — a Louisiana waterthrush and a Northern waterthrush. I used three criteria — location, season and plumage — to identify the bird in their photos as a Louisiana waterthrush.

Louisiana Waterthrush

Photo by Adobe Stock • Subtle plumage differences, as well as habitat, behavior and seasonal presence, are factors in distinguishing the Louisiana waterthrush, pictured, from the closely related Northern waterthrush. The Louisiana waterthrush nests along fast-moving streams in the area while the Northern waterthrush does not breed in the region.

 

The Chapmans had good reason to suspect the bird might have been a spotted sandpiper, but for the true identity of the bird in question, it’s necessary to delve into the family of warblers, which includes species such as American redstart, ovenbird, common yellowthroat, Northern parula and black-throated blue warbler.

The two waterthrushes are very similar in appearance. Louisiana Waterthrushes has a heavier bill and a white eye line, while the Northern Waterthrush’s eye line is usually somewhat yellowish-beige. A Louisiana waterthrush typically also has a whiter belly and underparts.

Appearance wasn’t even the most important element of the criteria. Location and season more readily helped confirm the identity. The Louisiana waterthrush has a range concentrated on the southern part of the eastern half of the United States, mostly south of the states of New York, Michigan and Wisconsin. In this region, only the Louisiana waterthrush is known to nest. The Northern waterthrush is strictly a spring and fall migrant, electing to nest near bogs and slow streams in Canada and the northern tier of states in the United States.

The Louisiana waterthrush also attracts attention with its characteristic “teetering” gait. Much like the spotted sandpiper, this waterthrush bobs the rear half of its body up and down as it walks and forages by the sides of streams. In their behavior, this shorebird and this warbler are very much alike. The waterthrush will often turn over wet leaves or other stream debris to search for prey items, such as aquatic insect larvae, crustaceans, snails and even small fish. The Louisiana waterthrush was once known as the water wagtail, which makes reference to the aforementioned teetering gait.

Waterthrush-Painting 2

Early artist and naturalist John James Audubon painted this Louisiana waterthrush.

Many warblers have shown signs of decline in recent years. The Louisiana waterthrush, however, appears to have bucked that trend. According to the website All About Birds, Louisiana waterthrush populations were stable between 1966 and 2015, based on statistics from the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 360,000, with almost all of those individuals spending at least part of the year in the United States. About a quarter of the population retreats into Mexico during the winter season. The rest winter in Florida and some of the Gulf Coast states, as well as the islands of the Caribbean.

While most songbirds are fortunate to survive two or three years in the wild, at least one Louisiana waterthrush lived to the age of at least 11 years and 11 months. The bird, a male, was seen in New Jersey in the wild and identified by a band on one of his legs. He had been banded in the same state, according to All About Birds.

The two waterthrushes are the only species in the genus Parkesia, so named to honor American ornithologist Kenneth C. Parkes, who was for many years Curator of Birds at Carnegie Museum of Natural History. The common name of the Louisiana waterthrush is not a very apt one, as this bird does not have any special affinity for the state of Louisiana. Someone collected some of the early specimens of the Louisiana waterthrush in its namesake location, and the name has stuck through the years.

Waterthrush

Photo by Bryan Stevens • Even in migration, both waterthrushes like to stay near water.

Not every bird mystery that comes my way via Facebook or in an email is so easily resolved. This identification, which happened to involve the New World warblers, my favorite family of birds, once again showed me the amazing diversity of this group of birds. From the terrestrial Louisiana waterthrush to the treetop-dwelling cerulean warbler, it’s an amazing group of songbirds I’m always happy to introduce to bird enthusiasts.

No cowbird ever knows its biological parents

While many birds are excellent parents, others lack any maternal or paternal instincts altogether. The common cuckoo, a nesting bird in Europe and Asia, is a well-known brood parasite that would rather slip its eggs into the nest of other bird than raise its own young. In scientific terms, “brood parasite” refers to creatures that rely on others to raise their young. In addition to some birds, this tactic is also employed by some species of insects and fish.

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Photo by Bryan Stevens • Female brown-headed cowbirds stay alert to observe bird leaving or coming to a nest. Once they have located a nest, these birds slip their own eggs into the nests of other birds.

The strategy is effective, if, in the human way of thinking, rather heartless. In biological terms, however, this “foster parenting” allows brood parasites to ensure a new generation without expending much energy on the part of the actual parents. Some recent contacts with readers have reminded me that not all of our feathered friends would qualify for “parent of the year.”

Mike Dickenson of Bristol, Tennessee, contacted me on Facebook about a discovery he made in a nest built under the steps of his house.

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Photo by Bryan Stevens • A female brown-headed cowbird visits a feeder.

“I noticed two blue eggs,” he said. “I checked a few days later and noticed two gray eggs also. Did another bird sneak her eggs into the nest?” Mike also informed me that some of the eggs hatched shortly after he discovered them.

James Rowland of Erwin, Tennessee, sent me a message on Facebook asking me to identify a bird in a photograph he had taken. “What is this bird?” James asked. “It’s larger than a sparrow.”

He added that he observed and photographed the bird near the Covered Bridge in Elizabethton, Tennessee. A study of the bird in the photo revealed a very nondescript bird in largely gray plumage. Few of our birds are this plain and gray with almost no standout characteristics.

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Photo by James Rowland • A brown-headed cowbird, probably a young bird or a female, near the Covered Bridge in Elizabethton, Tennessee.

In both cases, one of North America’s most successful brood parasites was involved. I responded to Mike and told him that is was entirely possible that a female brown-headed cowbird slipped some eggs into the nest beneath his steps. I likewise informed James that the bird in his photo looked like a brown-headed cowbird. I added that the bird was either a female or a young bird, since a male would have the brown head that gives the species its common name.

In North America, one of the best-known feathered brood parasites is the brown-headed cowbird. While many brood parasites are specialists, with females slipping their eggs into the nest of a specific species of host bird, the brown-headed cowbird approaches brood parasitism in a less discriminating manner. Female cowbirds have been known to lay their eggs in the nests of at least 221 different species of birds. No baby brown-headed cowbird ever knows its biological parents.

How did the brown-headed cowbird turn to a life of foisting eggs onto unsuspecting foster parents? The answer is connected with the American bison, also known as buffalo. When the bison roamed the Great Plains of the United States by the millions, flocks of brown-headed cowbirds followed the great herds, feeding on the insects flushed by the hooves of millions of bison. As the herds stayed on the move constantly, the cowbirds also developed a nomadic lifestyle. After the bison herd diminished, the cowbirds survived a potential crisis by simply transferring their bovine affinity from bison to domesticated cattle.

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Photo by Bryan Stevens • A male brown-headed cowbird displays the brown head that gives this bird its common name.

At times, this random and undiscriminating approach to reproduction fails. Some finches feed their young a diet that consists of a great deal of vegetable matter. Young cowbirds fed this protein deficient diet fail to thrive and ultimately perish.

Other birds blissfully bring a rich assortment of protein snacks — insects, spiders and other small invertebrates — that permits the young foster bird to thrive, at times at the expense of the host bird’s own young. About 20 years ago I observed a willow flycatcher bringing food to a young brown-headed cowbird at least twice the size of the “parent” trying to feed it. I’ve also seen song sparrows, dwarfed by a cowbird changeling, trying to keep their enormous baby bird well fed.

Cowbirds are members of the blackbird family, which includes such relations as orioles, meadowlarks and grackles. All cowbirds are confined to the New World and include species such as the screaming cowbird of Argentina, Bolivia and Brazil, as well as the bronzed cowbird of Central America and the southern United States, especially the states of California, Arizona, New Mexico, Texas, and Louisiana. Other cowbird family members include giant cowbird and the shiny cowbird.

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Early naturalist and painter John James Audubon painted this pair of brown-headed cowbirds.

Majesty of bald eagle suitable for America’s official bird

american bald eagle

Photo by David Dibert on Pexels.com A bald eagle comes in for a landing.

Here’s an early “Happy Fourth of July” to all my American readers. I thought this week’s post should focus some attention on our national bird, the American bald eagle, which officially became the national emblem in 1782 when the great seal of the United States was adopted.

Despite elevating this native bird to such lofty status, we have not always been kind to the bald eagle. We allowed habitat destruction and toxic pesticides to bring this eagle to the brink of extinction. With some protection, however, the bald eagle rebounded. In fact, the Department of Interior took the eagle off the endangered species list on June 28, 2007.

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Photo by Wayne Christensen on Pexels.com A bald eagle scoops a fish from the water with its talons.

The bald eagle has been more frequently observed by birders in Northeast Tennessee in recent years. Some of the area lakes in the region are good places to look for Bald Eagles, particularly in the fall and winter. A few lakes even host nesting bald eagles. For instance, this eagle has been documented nesting at Holston Lake in recent years.

I’ve observed bald eagles in Tennessee, South Carolina, Florida and Virginia. My most unusual observation of a wild bald eagle took place on Labor Day many years ago when an adult eagle flew over my grandparents’ home in Limestone Cove in Unicoi County. North America’s other eagle, the golden eagle, is a very rare visitor to northeast Tennessee. The golden eagle is primarily a bird of the western United States while the bald eagle ranges widely across the United States as well as into Canada and Mexico.
The eagles are incredibly majestic birds and important symbols of the value of natural places and creatures.

close up photography of white black eagle during daytime

Photo by Pixabay on Pexels.com The bald eagle had rebounded in population.

The bald eagle (Haliaeetus leucocephalus) is a member of a genus known as Haliaeetus, or sea eagles. There are seven other living species in the genus: the white-bellied sea eagle, Sanford’s sea eagle, African fish eagle, Madagascar fish eagle, Pallas’s fish eagle, white-tailed eagle and Steller’s sea eagle.

The bald eagle, however, is not considered closely related to eagles in the genus Aquila, or “true eagles,” in which the golden eagle is included.

close up photography of bald eagle

Photo by Flickr on Pexels.com The bald eagle’s place as the nation’s symbol seems very well secured.

Both male and female adult bald eagles have a blackish-brown back and breast; a white head, neck and tail; and yellow feet and bill. Juvenile bald eagles are a mixture of brown and white and reach full maturity in four to five years.

The female bald eagle is 35 to 37 inches in length, slightly larger than the male, with a wingspan that ranges from 72 to 90 inches. Bald eagles weigh from 10 to 14 pounds.

bald eagle bird clouds country

Photo by Pixabay on Pexels.com Bald eagles are often associated with wetland habitats.

 

Despite these impressive characteristics, the bald eagle is dwarfed in comparison to one of its now-extinct relatives. The largest eagle ever to evolve was Haast’s eagle, which once thrived in New Zealand. This eagle was named for the German geologist Julius von Haast, who founded Canterbury Museum at Christchurch in New Zealand. Haast, who died in 1887, was one of the first scientists to study large flightless birds such as the moa family that once roamed New Zealand.

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Julius von Haast

In fact, Haast’s eagle was considered a major predator on the population of New Zealand moas, some of which reached a height of 12 feet tall and a weight of more than 500 pounds. By contrast, female Haast eagles probably reached a weight of 22 to 33 pounds. Males, as is the case with most living eagles, are smaller than females and probably weighed between 20 to 26 pounds. This mega-sized eagle possessed a relatively short wingspan of roughly 8 to 10 feet wide. This wingspan compares to that recorded for large specimens of golden eagle and Steller’s sea eagle. Even the largest of today’s eagles, however, are about 40 percent smaller in body size than the size of Haast’s eagles. Despite their superior size, moas simply lacked any defense against the huge razor-like talons and sharp bill of the Haast’s Eagle.

Here are a few other eagle facts:

— Eagle bones are light because they are hollow. The beak, talons and feathers are made of keratin.
— The Madagascar fish eagle is the most rare eagle on earth, and one of the most rare birds. The current population is estimated at less than 400 individual birds, with perhaps around 120 breeding pairs.
— Bald eagles have 7,000 feathers.
— Wild bald eagles are long-lived birds and may live as long as 30 years. In captivity, however, the oldest documented Bald Eagle lived to be 47 years old.
— Bald eagles can lift as much as four pounds. They feed mainly on fish, but they will take advantage of carrion and scavenge for their meals. They will occasionally also take waterfowl as prey.
— The hunting area of bald eagles varies from 1,700 to 10,000 acres. Home ranges are smaller where food is present in great quantity.
— Bald eagles can fly to an altitude of 10,000 feet. During level flight, they can achieve speeds of about 30 to 35 miles per hour.
— All eagles are renowned for their excellent eyesight.
— Once paired, bald eagles remain together until one dies. Bald eagles lay from one to three eggs. The 35 days of incubation duties are shared by both male and female.
— Today, there are about 10,000 breeding pairs of bald eagles.

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I look forward to hearing from readers. Those who wish to ask a question, share an observation or make a comment may reach me at ahoodedwarbler@aol.com.

bald eagle in macro photography

Photo by Pixabay on Pexels.com Happy Fourth of July!