Animal might be not be specifically descript physically but we do not question his animal nature. If we want to talk shop, aka recognizable puppet features, then we should discuss Gonzo. How long did it take to figure out who he was and where he came from? At least with Animal his name and character are represenational of his personality, no matter what he looks like. Or, perhaps, we're trying to read too deeply into the animal of Animal. Even so, that's okay. It's fun to speculate.