Do any animals see in a spectrum other than visible light and infrared?
I found several images of how humans and bees view flowers differently.Bees and butterflies see into the ultraviolet. But as far as I know most animal vision is rather narrowly centered at the max solar ouput (yellow light).
Because we cannot see UV light, the colours in these photographs are representational, but the patterns are real.
The wide variety of nonspectral colours available to birds is the result of their ancient four colour cone visual system.
"Tetrachromacy — having four colour cone types — evolved in early vertebrates," said Stoddard. "This colour vision system is the norm for birds, many fish and reptiles, and it almost certainly existed in dinosaurs. We think the ability to perceive many nonspectral colours is not just a feat of hummingbirds but a widespread feature of animal colour vision.
For humans, purple is the clearest example of a nonspectral colour. Technically, purple is not in the rainbow: it arises when our blue (short-wave) and red (long-wave) cones are stimulated, but not green (medium-wave) cones. While humans perceive just one kind of nonspectral colour — purple — birds can theoretically see up to five: purple, ultraviolet+red, ultraviolet+green, ultraviolet+yellow and ultraviolet+purple.