Koalas look cuddly, but they're actually irritable, solitary beasts who do not want belly rubs. What kind of mocking god created creatures with poofy ears and big black noses that don't want belly rubs? BOpossums: North America gets one lousy marsupial, and let's just say it's not going to win any beauty contests. Or even not-ugly contests. C−Wombats: "Wombat" is a great name. It's got a "wom" and a "bat," and an "omba." They're kind of nondescript animals, cute in a generic pudgy mammal way, but their name spelled backward is "tabmow," and that makes all the difference. AThe Book of Ratings is hysterically arbitrary and undeniably infectious.