The kill and rip until its small enough to carry Off in their beak. Do not confuse the road kill eating turkey vulture with the black vulure. Black vulurres will attack and rip apart calves as they're being born . They prey all year going after large and small animals.
If it's a raptor you'll just have to wish it dead, as they are protected by federal law. Best option if it is, is to lock up the birds until it moves on.