Only three of the roughly 1,400 kinds of bats live on this liquid-only diet
WASHINGTON Scientists have figured out why vampire bats are the only mammals that can survive on a diet of just blood.
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Most mammals couldn’t survive on a low-calorie liquid diet of blood. Only three vampire species of the 1,400 kinds of bats can do that the others eat mostly insects, fruit, nectar, pollen or meat, such as small frogs and fish.