I have had a look into animals that see only in infrared rays or use them for detection, along with animals that can see ultraviolet light and those that see solely using visible light, like humans .
Infrared and ultraviolet light are touched upon within the theory of relativity, but are not discussed at a great length, and so I think it would be interesting to continue in that direction with my own work.

I started by looking into the spectrum of light wavelengths. I found this diagram below. It was interesting to see on the spectrum the difference between ultraviolet light, visible light and infrared light.