Osteophagia... As a guide in South Africa, I had a hard time with a group of tourists. They thought all the large mammals were carnivores and giraffe were at the top of that list. It didn't help when we saw a giraffe with knees bent like they do when drinking, except it was chewing on an antelope carcass, killed the week before by a pack of African wild dogs... Apparently it's an easy source of phosphorous and mainly herbivores will do it. Needless to say, they never believed another word I said after that, and there was no tip at the end if their week-long stay either.
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