Scientists figure out how vampire bats got taste for blood

This photo provided by Sherri and Brock Fenton/AAAS in March 2022 shows a vampire bat in flight. According to a report published Friday, March 25, 2022, in the journal Science Advances, scientists have figured out why vampire bats are the only mammals that can survive on a diet of only blood. (Sherri and Brock Fenton/AAAS via AP)

This photo provided by Sherri and Brock Fenton/AAAS in March 2022 shows a vampire bat in flight. According to a report published Friday, March 25, 2022, in the journal Science Advances, scientists have figured out why vampire bats are the only mammals that can survive on a diet of only blood. (Sherri and Brock Fenton/AAAS via AP)

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