Normally, we think of evolution as a good thing for a species. Humans, we evolved to walk on two legs and talk and stuff. Bacteria evolve to overcome whatever new antibiotic we try to throw at them. But it appears that, for woolly rhinos, evolution decided, “lol, no.”
Humans have been fighting each other for thousands of years, but our ancestors had to worry about all sorts of savage killers. As an ancient, heavily gnawed femur bone highlights, we weren’t always at the top of the food chain.