Vultures aren’t typical poster birds for ecological awareness, but perhaps they should be

vultures-tree

Photo by Bryan Stevens • A flock of vultures gathers in a dead pine tree on a gloomy winter afternoon.

Cougars have returned to eastern mountains, white-tailed deer numbers are out of control and hungry black bears sometimes wander into towns. Encounters between humans and wildlife are nothing new. I was reminded of this fact when I received a recent email from Gene Sturgeon on the subject of vultures. Gene and his wife, Catheryn, reside in Abingdon, Virginia. The town, it would seem, has experienced a recent invasion.

“In our new neighborhood, the black vultures are ever-present,” Gene wrote. “They circle endlessly, and never seem to land on the carrion that attracts them. Turkey vultures typically are seen on the carrion, but these blacks never appear to be feeding. Also, I can’t imagine this neighborhood has more than the normal number of dead animals.”

Gene has also observed that the black vultures, starting in mid-afternoon, begin to gather in selected trees. Usually two nearby trees, he noted, will contain dozens of them for the night.

vulture-tower

Photo by Bryan Stevens • Vultures gather atop an industrial building in downtown Erwin, Tennessee.

Gene asked if the behavior he has observed is fairly typical. I replied to his email that I believe that his observations are accurate and typical. While the birds seem to be roosting in his neighborhood, they are probably not finding their food there. Vultures are capable of soaring long distance in search of food, so they may actually be dining far away from Gene’s Abingdon neighborhood.

bryan-vulture

Photo by Bryan Stevens • A turkey vulture perches on a branch in a South Carolina woodland.

I asked him if there were pine trees or other types of evergreens because it’s my understanding that vultures are often fond of thick stands of pine. I am guessing this is because such trees offer protection and shelter from the elements. Gene wrote back to inform me that both pine trees and leafless trees are present near his home. “The leafless tree attracts the larger cloud of black vultures,” he added.

Doubtless, some residents are uneasy when these uninvited neighbors swell the neighborhood. I was somewhat surprised by Gene’s observation, but I was also taken aback to learn that Abingdon has for years boasted an extremely substantial population of vultures. In fact, the Abingdon Police Department has even compiled a fact sheet to educate the public about these large birds. According to the release, it is around this time of year that Abingdon sees an increase in the number of vultures due to weather patterns. The APD has apparently received complaints from some citizens about the vultures roosting in their neighborhoods.

tvultures

Photo by Bryan Stevens • Turkey vultures forage in a freshly mowed field near Abingdon, Virginia. As scavengers, vultures play a vital but often unappreciated role in the environment.

I was glad to note that the fact sheet recognizes the important of vultures in the ecosystem. These large birds serve an important function. Without vultures, local yards and roads would be littered with rotting, stinking, animal carcasses — and the health risks that accompany them.

Nothing prohibits a private land owner from contacting a professional wildlife specialist to disturb the roosts at owner expense. If I might offer unsolicited advice, however, I’d recommend against wasting your money. The tactics, while they may make a temporary difference, don’t usually solve anything in the long run.

vultures-soaring

Photo by Bryan Stevens • Turkey vultures in their usual V-shaped silhouette characteristic of a soaring vulture.

Abingdon’s government, for both ethical and legal reasons, cannot kill vultures. Private citizens are also forbidden by law to kill vultures or hire exterminators to do so. Vultures are protected by the Migratory Bird Treaty Act. The birds, their nests and eggs cannot be killed or destroyed without a permit from the U.S. Department of the Interior’s Fish and Wildlife Service. Private citizens are also not legally permitted to use fireworks to try to disperse vulture flocks.

The best thing to do is make your home and yard less attractive to these large, scavenging birds. While reading some tips put forward by the APD, I was struck by how some of the advice, if followed, can protect homes from other potential nuisance wildlife ranging from raccoons and opossums to black bears and skunks. According to the APD, there are several things people can do to make their yards less attractive as a roosting place for vultures:
• Ensure that you are not inadvertently attracting the vultures. Common attractions include open containers of pet food, uncovered garbage cans, and pet food bowls.
• Remove any dead trees that make convenient perches for vultures.
• Use humane perch deterrents, like motion-activated sprinklers or lights.

vulture-halloween

Photo by Bryan Stevens • A Turkey Vulture perches in a woodland in Roan Mountain, Tennessee, during late fall.

The APD also pointed those wishing for more information to the Cornell Lab of Ornithology website, which has excellent information about both species of vulture, including conservation information.

I was very pleased to see that the APD tried to dispel misinformation about these valuable birds. People are, naturally enough, concerned for their pets because of the presence of these large birds. Vultures are carrion eaters, which means eat animals that are already dead, preferring animals that have been dead for two to four days. While there are no accounts of turkey vultures preying upon live animals, there have been occasional reports of black vultures preying upon small, live and relatively defenseless animals.

That tells most, but not all, of the story. Black vultures occasionally will attack newborn livestock, but these birds are not likely to go after the family dog or cat, especially if the pet is mobile and in good health. Nevertheless, it is still a good idea to keep cherished pets indoors. While vultures pose little danger to them, plenty of other animals, such as coyotes, are much more opportunistic than vultures. Keeping cats and dogs confined indoors also protects wild birds and other wildlife from the instinctive predatory notions of our precious pets.

BS-VULTURES

Photo by Bryan Stevens • A black vulture and two turkey vultures share a perch near Boone Lake in Sullivan County, Tennessee.

While both vultures are migratory birds, their numbers have always fluctuated and will continue to do so. As their populations increase, their range has increased as well. Both species are present in the Abingdon area year-round. Because of the town’s location, their numbers increase from November through early February as they follow the weather patterns. In colder periods, they move farther south, in warmer periods, farther north. Abingdon’s climate makes for a good wintering location. As it gets warmer, non-resident flocks tend to move farther north.

Like many other species of birds, some vultures have learned to co-exist near humans, just like such birds as Canada geese, Eastern bluebirds, American robins and mallards. Like these birds, vultures are highly adaptive creatures. Unlike some types of wildlife that shy away from human contact, vultures and some other birds have adapted to the human environment – perhaps a bit too well. Vulture behavior can be destructive. In recent years, some of these destructive tendencies have become quite infamous among birders. This new behavior apparently first surfaced among vultures wintering in south Florida.

TurkeyVulturesClean

Photo by Bryan Stevens • Turkey vultures regularly dispose of road-killed animals.

They have been known to tear window and roof caulking, vent seals, shingles, rubber seals on car windshields, windshield wipers and other soft, rubbery materials. In addition, their excrement is acidic and may damage painted surfaces and landscaping. The birds also regurgitate a smelly, acidic vomit. Unfortunately, vultures apparently pass on these bad habits to others of their kind and such aberrant behavior is now being seen outside of the Sunshine State.

According to the APD, flocks of as many as 100 vultures have been documented in Abingdon. This number may rise and fall, depending on conditions. Vultures are part of the web of life, which connects them and their fellow creatures to our own lives. Turkey vultures are larger than black vultures, weighing about four to five pounds, with a wingspan of six feet. The turkey vulture’s most distinctive feature is its bright red, featherless head. In flight, a turkey vulture often appears to be “wobbling” and, from underneath, all of the flight feathers are light colored.

Turkey_Vulture_edited-1

Photo by U.S. Fish & Wildlife Service • Turkey vultures have bare red heads, as opposed to the black heads of the related black vulture. While larger than black vultures, turkey vultures are less aggressive than their smaller relatives.

On the other hand, black vultures are smaller, weighing less than four pounds, with a wingspan of five feet or less. The black vulture’s head is grey and featherless, but larger in proportion than the turkey vultures. Viewed in flight, only the outer flight feathers of the black vulture are white.

Although smaller in size, black vultures are feisty and aggressive birds. They often outcompete turkey vultures at carcasses. They will also only reluctantly abandon a feeding site at a carcass. My family almost learned this the hard way during a trip to South Carolina when my father almost ran his car into a flock of black vultures feeding on a road-killed deer. I warned him that the vultures might not get out of the way, and he slowed the car’s speed. The vultures hopped back from the edge of the road as our car traveled past them. Looking back, I noticed they immediately hopped back onto the carcass after we had passed. If we had sped past at full speed, one of the bird’s could easily have panicked and flown into our path. A four-pound bird can do a lot of damage if it hits the windshield of a car traveling at 40 to 50 miles per hour. Trust me! You don’t want to put this to the test.

Perhaps that’s the moral of the story. Give vultures a wide berth and, in theory, they will do the same for you. Let’s face it. Vultures aren’t going to be cute and cuddly faces for ecological awareness. A polar bear or penguin, vultures simply are not. They still have a role to play, and we should be grateful they were created for just that purpose.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s