The olinguito, as its name suggests, is highly similar to another member of the raccoon family, the olingo, an arboreal, nocturnal animal that looks more like a combination of a possum and a monkey than a raccoon. In fact, says Smithsonian, there was actually an olinguito in American zoos in the 1960s, kept in cages with olingos. "Its keepers were mystified as to why it refused to breed with its peers," writes Joseph Stromberg at Smithsonian. But now we have proof as to why: a new study published today in the journal ZooKeys has established through DNA and other anatomical evidence that the olinguito, Bassaricyon neblina, is a distinct species. No wonder it didn't mate with an olingo!