Rizzo the Rat is a Muppet character, created and performed by Steve Whitmire. He is a fictional rat who appeared on The Muppet Show and numerous films, with a starring role in the 1992 film The Muppet Christmas Carol.
Obviously, don't nominate any human characters. Hybrids like Cheetah or The Lizard are okay, as are shapeshifters with one set animal form (eg Professor McGonagall.)
