Check out the episode of PBS Eons about "Hell Pigs". Archaeotherium and Daeodon were species that lived in North America from about 40 million to 17 million years ago. The group may be most closely related to modern whales and hippos. As always, a very interesting and informative video!
Despite the name, we don’t know where the so-called “hell pigs” belong in the mammalian family tree. They walked on hooves, like pigs do, but had longer legs, almost like deer. They had hunched backs, a bit like rhinos or bison. But as is often, if not always, the case, there is some evolutionary method to this anatomical madness.
