No vulture other than the lammergeier has a diet consisting of 85-90% bone. It's capable of swallowing and digesting bones as large as a sheep's vertebrae, and if it encounters a bone that's too large it will drop the bone onto the rocks from the sky until the pieces are small enough to eat.

(Close ups under the cut)

Bearded Vulture (Gypaetus barbatus), family Accipitridae, order Accipitriformes, Himachal Pradesh, India

Also known as the lammergeier (“lamb vulture”) or ossifrage (“bone breaker”)

Feeds primarily on bones