Article: Vampires!(vampire bat behavior)(Cover Story)

It's midnight in Costa Rica, a country in Central America. A rocky mountainside gleams silver in the light of a full moon. The mouth of a cave looks like a black stain on the rocky slope.

Inside the cave, a dozen vampire bats hang by their toes from the stone walls. They're hungry! But vampires almost never hunt when the moon is bright - owls and other enemies might see them and gobble them up. So this bunch of bats is waiting for the moon to set.

Female bats and their pups cluster near the top of the cave wall. Below, two screaming male bats lean toward each other with hair bristling and wings beating. Each of them wants the best space - the one closest ...

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