BTW, Minnie was quite smart (and lived for 17 years); Grisabella does not appear to be a dummy, either.

And I forgot Poof, a patchwork-quilt calico with bright orange and black on her white background. I took over her care when she turned out, after spaying, not to be a good kids' cat for my neighbors. She was, until her dotage at age 15, apparently not stupid, but she was neurotic as hell-- almost afraid of her own shadow--, though she liked being petted. No one really knew why her personality changed so dramatically after the neutering. I doubt that it had to do with being calico, though.