News Animals In a first, these bats were found to have toes that glow Hairs on the feet of Mexican free-tailed bats fluoresce under UV light Under an ultraviolet light, toe structures on this Mexican free-tailed bat glow a brilliant cyan. F. Gual-Suárez By Jason Bittel August 28, 2024 at 11:00 am Read another version of this article at Science News Explores Share this:Share Share via email (Opens in new window) Email Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Print (Opens in new window) Print You’ve heard of jazz hands? Well, these bats have glow toes. When ultraviolet light shines onto the Mexican free-tailed bat’s extraordinarily hairy toes, they light up like a Christmas tree.