The first is a picture I took of a hairy-legged vampire bat (Diphylla ecaudata) from a cave in Mexico. The second picture shows a group of common vampires (Desmodus rotundus) at the Organization for Bat Conservation in Michigan. The photo is black and white because it was shot using infrared light. The bracelets on the arms are bat bands used to mark each bat individually (although some you can recognize by their face!). The third picture shows one female bat regurgitating food (cow blood) to another female that did not feed.