Magnificent Baddies who belong to animal species, be it Insects or other Invertebrates, Fish, Amphibians, Reptiles (including Dinosaurs), Birds or Mammals (including all Primates outside of Humans).

Since Magnificent Baddies need to be highly intelligent, pretty much all MBs who are Animals will be Anthropomorphic. The only exception are animals that, while never expressing human-like behavior like talking or showing visible emotions, still are good enough tricksters and are clearly indicated to be doing all of it intentionally. The Goose is a great example of a non-anthropomorphic Animal that still manages to be an MB.