https://www.atlasobscura.com/articles/reindeer-may-not-be-able-to-fly-but-they-do-have-ultraviolet-vision https://www.atlasobscura.com/articles/reindeer-may-not

https://www.atlasobscura.com/articles/reindeer-may-not-be-able-to-fly-but-they-do-have-ultraviolet-vision https://www.atlasobscura.com/articles/reindeer-may-not-be-ab... (I don't know if that means reindeer are able to distinguish it from other colors or if they're sensitive to it but ultraviolet-something-colorblind)