There was someone on here, who watched Vultures circle and run I believe it was rabbits till they tired and then swooped down and killed them.... they thought possibly due to lack of dead prey.... I am old enough that what is told on the Tv shows about animals and birds and the books aren't necessarily true. But then , documentation turns up that refutes it.... like deer that eat meat, wolves that killed 72 Elk calves at once and just ate the noses, coyotes /coydogs that have attacked people and children that I think we often don't know as much as we think about animal and bird adaptability and intelligence. I have seen birds watch another and then learn the behavior, as with dogs, horses, etc.... I believe it is possible it is the Turkey Buzzards could have learned to do that if motivated enough.... however if the birds were killed when you weren't home or around it may be another predator... but why did they leave the meal so quickly? I just watched crows chase off a hawk, later in the day I saw a mockingbird chase off a crow.....