Nature doesn't care about emotions. We watch lions just tearing up gazelles willy-nilly and animals just leaving their dead to rot. But a few animals have developed at least a little bit of feeling (or a lot of feelings, as we are reminded whenever we are around moody teenagers). Shockingly, elephants have led the charge on this, mourning for their dead and even holding funeral practices.
Researchers have long suspected that elephants do this but find it nearly impossible to get any video footage of it. Elephant funerals are really exclusive affairs evidently, and they aren't fans of humans showing up to film. Frankly, after all the poaching, we wouldn't trust humans either if we were elephants. However, really sneaky researchers have watched elephants bury their dead under foliage. Researchers have even discovered elephant cemeteries. Some elephant families go through the effort of burying all their dead in the same place.
We also know that when a member of their family dies, elephants become more stressed and depressed. How they developed a respect for the dead is still a mystery, but it's a fascinating example of how animals can feel in ways similar to humans. Knowing that, it makes the ivory trade even sadder.