People have been warned of vampire bats that is now feeding on human blood and posing danger to many lives.
Vampire bat
Despite their terrifying names as 'vampire bats', these creatures
were previously only thought to feed on the blood of birds. But new
research shows that vampire bats may live up to their name, as they have
been caught feeding on humans for the first time. The worrying prospect
could lead to the spread of disease, as vampire bats are known to be
major transmitters of rabies.
Vampire bats rely solely on blood as their only food source, but
usually get this from wild birds. Researchers from the Federal
University of Pernambuco in Brazil set out to look at how the species
would behave in a situation of scarcity of birds.
The team analysed 70 faeces samples from a colony of hairy-legged
vampire bats, living in the Catimbau National Park in Brazil. To their
surprise, they found that three samples contained traces of human blood.
Speaking to New Scientist, Enrico Bernard, lead author of the study, said: 'We were quite surprised.
'This species isn't adapted to feed on the blood of mammals.'
Mammal blood tends to have a thicker, high-protein content than
bird blood, making it more difficult for the bats to process. In
previous studies, when there is no wild bird blood available, bats have
fasted and even starved to death, rather than attempting to try pig or
goat blood.
The researchers believe that human intrusion in the national park
could be driving the vampire bats to try mammal blood. In their paper,
published in Acta Chiropterologica, the researchers wrote: 'The
record of humans as prey and the absence of blood from native species
may reflect a low availability of wild birds in the study site,
reinforcing the impact of human activities on local ecological
processes.'
As well as traces of human blood in the faeces, the researchers also found that most of the samples had chicken blood in them.
Mr Bernard said: 'They are adapting to their environment and exploiting the new resources.'
The findings are a cause for concern for people in Brazil, as the bats could spread disease, such as rabies.
In the paper, the researchers added: 'This opens a range of
research possibilities on vampire bats in the Caatinga, both on the
species' biology and the consequences for public health, considering the
potential increase in the transmission of rabies in the region.'
The researchers believe that the bats enter houses through holes in
the roof or windows, or target people sleeping outside. They now plan
to visit the homes of nearby residents to find out how often they are
being bitten, and why.
No comments:
Post a Comment