I had a rat that was so intelligent that she could not only fetch a ball, but taught 3 other rats to do it too. "Juliette." But she had no self awareness whatsoever. One time she backed herself into a too-tiny igloo, then made several trips halfway out to pull more paper scraps in with her. Just when I thought she had got all the nearby paper, she popped her head out again, picked up her own tail that was still sticking out, and dragged it back in the igloo with her teeth. My roomate and I were in tears from laughing.