On top of the cage sits the note: "Keep." From this, we might discern that, like Gonzo in Muppets From Outer Space, Animal comes from a pack of creatures like him. But he was left behind.
Animal might be the most Muppetty of all Muppets. He's the drummer for the ... He almost never uses contractions when he speaks, and his not-so-secret alter. ego, Super Grover, is more inept ...