"So blood is the only thing they eat. So we didn't have to worry that maybe they'd eaten some fruit earlier in the day, that's not part of their diet. So they would have exclusively eaten blood the ...

Experiments with vampire bats running on treadmills have revealed they have a highly unusual method of getting energy from protein, due to their specialised diet. Most mammals get the bulk of their ...

Vampire bats may have earned their name, as the Smithsonian Channel describes them... (SOUNDBITE OF ARCHIVED RECORDING) UNIDENTIFIED COMMENTATOR: Vampire bats are the only bats in the world that feed ...