A humpless, snouted camel? Check. A rhino with the teeth of a rodent and head of a hippo? No problem, scientists say, after apparently figuring out, finally, where these mystery creatures sit on the mammalian family tree, Nature reports.
Charles Darwin discovered fossils of these ancient creatures while visiting South America in the 1830s, but failed to classify them (and called the rhino-like animal "perhaps one of the strangest" ever discovered).