Posted: April 29, 2017 at 8:39 pm TIL reindeer are one of the only mammals that can see UV light, allowing them to see lichen, polar bears against the snow, and urine trails submitted by /u/ben_abuyah to r/todayilearned [link] [comments] Source: Reddit: TGIOKDI Upvoted Leave a Reply Cancel replyYou must be logged in to post a comment.