A number of replies to this comment point out that modern animals also eat bone marrow. However, that may have not been the case a couple million years ago. In

A number of replies to this comment point out that modern animals also eat bone marrow. However, that may have not been the case a couple million years ago. In “Guns, Germs, and Steel”, Diamond points out that animals in Africa are particularly vicious and dangerous due to their coevolution with humans. Animals outside of Africa rapidly went extinct as evolved humans spread to the rest of the world, since they didn’t have the same evolutionary opportunity. I know little about evolutionary biology or zoology, but I’m curious if the modern behavior/capability of animals to eat bone marrow could be the result of evolutionary pressure from coevolution with humans.