Today, I figured that we'd keep the chimpanzee theme going, what with their genetic closeness to humans being touted as some kind of reason to pay them special attention relative to other sentient organisms.
Chimps may be able to recognize themselves in a mirror, but do they understand that other organisms cease to exist? Nope. The below video showcases a baby chimp playing with a mummified corpse. The mother of the deceased infant went on to carry the mummy around with her for 68 days. I doubt that they're necrophiliacs, so my guess is that these animals just thought the thing was sleeping the whole time.