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Thriving on Cattle Blood, Vampire Bats Proliferate

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Vampire bats living in Central and South America weigh in at an ounce (30 to 40 grams). Credit: Christian Voigt/Leibniz Institute for Zoo and Wildlife Research (IZW)

Vampire bats living in Central and South America weigh in at an ounce (30 to 40 grams). Credit: Christian Voigt/Leibniz Institute for Zoo and Wildlife Research (IZW)

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