Chances are they are vultures circling their prey. Two species of vulture are common in this area, the Black Vulture and the Turkey Vulture. The Turkey Vulture ranges from Southern Canada to the tip of South America. As you may have guessed by looking at these birds, Turkey Vultures get their name from their resemblance to turkeys.
Vultures are commonly, but incorrectly, referred to as buzzards.
Buzzard actually refers to the group of broad-winged hawks. Vultures, unlike other birds, have no feathers on their heads. Their heads are featherless as an adaptation to defend against bacteria. As the vultures feed, their heads become covered with bacteria present on rotting carcasses. The sun can kill this bacteria more easily on a featherless head than on a head covered in feathers.