A new study published in December
in the journal Acta Chiropterologica and first reported in New
Scientist finds that the bats have started to feed on human blood,
something scientists didn't even think was possible.
As people have started to move into the
Caatinga dry forests of northeastern Brazil, they've been cutting down
trees and hunting the tinamou and guan birds these bats would normally
drain for a meal.
So a group of researchers from the
Universidade Federal de Pernambuco in Recife, Brazil, decided to test
the bats' feces to see what they'd been eating as their normal meal
sources disappeared, thinking they may have decided to turn to the
animals that humans bring with them.
The authors of the study write that they wanted to know "how the species would behave in a situation of scarcity of wild birds and increase in the availability of domestic animals."
DNA analysis showed they'd been
consuming chicken blood — not a big surprise. But it also showed that
the bats had been preying on humans.
"We were quite surprised," Enrico Bernard, who led the study, told Sandrine Ceurstemont of New Scientist. "This species isn't adapted to feed on the blood of mammals."
Ceurstemont writes that the bats "are adapted to process fat, the main component of bird blood, as opposed to the thicker, high-protein blood of mammals."
As a dietary change, this isn't just
creepy. Bats have a remarkable capacity to carry viruses that can be
deadly to humans. In northeast Brazil, similar cases have led to rabies
outbreaks in the past.
In 2005, deforestation and human movement
led another sort of vampire bat (pictured above) to bite more than
1,000 people, infecting a number with rabies and causing at least 23
deaths.
The hairy-legged vampire bat has been known to carry the deadly hantavirus, according to New Scientist.
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