I don't think we can get good infra-red vision. Creatures with infra-red vision are usually cold blooded. We shine too brightly in infrared from within to be a

I don't think we can get good infra-red vision. Creatures with infra-red vision are usually cold blooded. We shine too brightly in infrared from within to be able to see something outside. But tetrachromacy should rightfully belong to us. It was lost by our pre-mammal ancestors, while reptiles still have base tetrachromacy, and some fish perceive even more colors. Most animals only perceive two colors and grow two pigments. Makes animal coloring (and animal world) kind of boring for us. Birds use bright colors because they can distinguish them.