I have written before about vultures here, here, here, here and here. But have you seen this video? Most vultures specialize on dead leftover flesh, but the bearded vulture wants only the bones. It swallows the bones whole. According to Houston and Copsey 1994, their digestive tract might have additional acids to deal with bones and that the additional nutritive qualities of a bone-only diet make it all worth it, especially in barren landscapes with fewer carcasses to find.