A female fringe-lipped bat, Trachops cirrhosus. Also sometimes known as the frog-eating bat. The function of the mouth tubercles are a mystery. Its long been hypothesized that they are used for chemo-reception, that the bat can fly over a frog or toad and just brush its skin with its lips, thus very quickly (and non-lethally) assess the palatability of its prey. Nobody knows for sure though.