Wish I knew... I thought buzzards only eat things that were already dead but I have no idea. 

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Buzzards are also known, in various parts of the country, as chicken hawks or chicken buzzards. The can and will attack small living animals. They will also eat dead animals. We have "chicken hawks" by the dozens here in West Texas. So far we have had no loss to them but they have come down to about 4 feet above ground before our dogs chased them off.
And here, there's no such thing as a chicken hawk. BoP are only called chicken hawks by folks who don't know the true name of the hawk in question. I know a hawk when I see one, but have been told in no uncertain terms by folks who can id a hawk on the wing simply by it's profile... "There's no such thing as a chicken hawk."