Bats are the only mammals that can fly, but vampire bats have an even more interesting distinction—they are the only mammals that feed entirely on blood.
These notorious bats sleep during the day in total darkness, suspended upside down from the roofs of caves. They typically gather in colonies of about 100 animals, but sometimes live in groups of 1,000 or more. In one year, a 100-bat colony can drink the blood of 25 cows.
Common Name: Common Vampire Bat
Scientific Name: Desmodus rotundus
Group Name: Colony
Average life span in the wild: 9 years
Size: Body, 3.5 in; wingspan, 7 in
Weight: 2 oz (Varies; can double in one feeding)
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