I hear this sentiment often, but it doesn't match my own experience with orange cats... the one I had back in high school (orange male) was at least as intelligent as any other cat I've had. The orange female I have now is very clingy / anxious and far more territorial than any of my other cats, but otherwise demonstrates at least average cat intelligence. I'd had a variety of different types of cats - a japanese bobtail, a balinese, a siamese, various calicos and domestic types - and the orange ones have been on the upper end of intelligence by comparison.