If you want something really psychedelic, you should check out UV biofluorescence in fish.
- https://www.nationalgeographic.com/animals/article/biofluorescent-catsharks-glow-underwater-with-tiny-lightsabers-metabolites
- https://phys.org/news/2014-07-red-fluorescence-fish-vision-uv.html
- https://web.archive.org/web/20220719071005/https://www.nytimes.com/2022/07/19/science/lumpfish-glow-ultraviolet.html
- https://royalsocietypublishing.org/doi/10.1098/rspb.2014.1211