Are There Other Extra Colours?

Millions of people have colour blindness, which means that one of those classes of color sensing cells either is missing or doesn't quite work in the usual way. So are there other extra colours? This answer is a little complicated. Lutely, birds, for example, are tetrochromatics. They have four kinds of colour sensitive cells in their eyes and they can see ultra violet. Mantistrims are actually substantially worse at discriminating between different colours than humans, or basically any other animal that has been studied. And seems that their style of colour vision is just radically different from that of any other animal. There's this huge range of what are called non spectral colours to which we