Is there any way to chase a group of American black vultures off your property?

There is a way. But it depends on how many vultures. If you have a dog, you can get it to run at the vultures. But if they are always n yor yard, there must be a nest, or a carcus, nearby. Try to find the carcus, if there is one, and remove it. If thre is a nest (and you dont want to kill the babies) you can barely do anything without killing them.

It also depends on how frequent they are on your lawn.

But, try not to run at them. It also may not be safe for your dog too. Black vultures are more aggressive then turkey vultures.

Try finding a big fake dog, and put it in the center of where the vultures are. Make sure it is strong, for if it falls over, it may seem like food to them. Change the position everyday.

(please ONLY do this if you have to, if they havent left after about two months) You may have to call in somebody, to catch them and release them somewhere else. It may be bad for if they have eggs. If so, after they have left, bring the eggs to a wildlife rescue center. There they would care for the eggs.

You can try these methods. They can work, so try them.