For vampire bats, regurgitating blood into a roostmate's mouth is a sign of ultimate trust. It's a risky strategy for the creatures, who don't know if donating their food will be reciprocated. Vampire ...

Humans are often happy to share food with their friends, but what about animals? Contrary to their reputation, vampire bats are surprisingly social and generous, and a well-fed bat will even ...

WASHINGTON — Scientists have figured out why vampire bats are the only mammals that can survive on a diet of just blood. The bats live in South and Central America and are basically “living Draculas,” ...

You can probably picture a vampire: a pale, sharply fanged, undead sucker of blood, deterred only by sunlight, religious paraphernalia and garlic. They’re gnarly creatures, often favorite subjects for ...

Add Yahoo as a preferred source to see more of our stories on Google. Vampire bats have complex social relationships. Samuel Betkowski/Moment via Getty Images You can probably picture a vampire: Pale, ...

Most mammals respond to the demands of exercise in the same way, by breaking down carbohydrates and stored lipids (fats) in their bodies, releasing the energy they need to keep functioning. But every ...