Animal is just a wild man who's let himself go abit. He doesn't worry too much about his appearence, that's why his hair and beard are so unkempt. I never considered he was anything but human or at least humanoid. I'm pretty sure Clifford is humanoid too. He's a cool and very laid back rastafarian. Check out some of his early appearences (ie the interview that Jim and Kermit did just before Jim's death that includes Clifford stealing the show) and when he was part of the Electric Mayhem. Gonzo is and will always be a "whatever". "He's a little like a turkey". He could just be another humanoid character who isn't too great in the looks department.