Vampire bats are amazingly well-equipped to live on a diet of blood and only blood - something no other mammal in the world does. Its teeth are so razor-sharp that the bird or mammal it feeds on usually does not even feel the tiny bite it inflicts. Learn more about the Diphylla ecaudata, more commonly known as a Hairy-legged Vampire Bat, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.