Vampire bats will prick the skin of their prey. Their saliva contains an anticoagulant which helps them lap up blood with their tongues. These bats are light enough that, many times, they can drink without the other animal even knowing they are there. They have heat sensors on their nose which help them detect good feeding spots.
The three species of bat that feed solely on blood, a trait called hermatophagy, bite their hosts (mammals and birds) using razor sharp upper incisor teeth and lick the blood that issues from the wound. The bat’s saliva contains anticoagulants that keep the blood from clotting, prolonging the feeding time. The kinds of bats that eat this way are the Common Vampire Bat, Hairy-legged Vampire Bat, and White-winged Vampire Bat. They are native to the Americas ranging from Mexico to Brazil, Chile, and Argentina.
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