Among the animals that keep cropping up here from time to time are: civet (a species of cat), okapi (a species of antelope), dugong (sea mammal superficially similar to the manatee, to which it is related), beluga (a species of whale), narwhal (an oddball species of whale with a single, spiral tusk), walrus, and very occasionally, we see platypus (the other Australian monotreme) and hyrax (superficially rodent like mammal whose closest relatives are actually the elephants). Others to look out for include lemur (a distant primate cousin of ours), possum and the American opossum (both marsupials), pangolin (armoured anteaters from Africa and Asia), tenrec (any of a diverse range of mammals from Madagascar), colugo (known as flying lemurs, even though they're not primates), tapir (relations of pigs with elongated snouts), kudu(large antelope with spiral horns), oryx (another antelope), gemsbok (a particular species of oryx), nyala yet another antelope), and impala (yet another antelope, also the name of a Chevrolet car).
The rodents alone are a Scrabble player's points fest, with degu, coypu, gerbil, jerboa and agouti to name but a few.
Meanwhile, among the rodents, here's one that won't appear in the game, but is worthy of note: Dinomys branickii, otherwise known as Count Branicki's Terrible Mouse. Unless it appears in its alternate guise as the pacarana. There's something Pythonesque about an animal with that name. It's notable not only because of its faintly hilarious name, but because it's related to a fossil rodent, one Josephoartigasia monesi, that lived in South America in the Pliocene. This was, in effect, a sort of giant guinea pig that was the size of a hippopotamus. But if you want a really big mammal, try Paraceratherium from the Oligocene era, which lived in Asia - this distant relative of the rhinoceros may have been a 10 ton beast, with some estimates of the 15 to 20 ton order, and may have been 17 feet high at the shoulder.