You are watching: Birds that feed on dead animals
In the very first analysis of bacteria life on vultures, the study"s researchers found that this scavengers are laden v flesh-degrading Fusobacteria and poisonous Clostridia. As bacteria decompose a dead body, they excrete toxic chemicals the make the carcass a perilous meal for many animals. However vultures often wait for decay to collection in, offering them easy accessibility to dead pets with challenging skins.
Moreover, vultures will frequently pick in ~ a dead pet through its earlier end — the is, the anus — to get at the tasty entrails. Your diet may be filled with toxic bacteria and also putrid feces, but vultures are supposedly immune to these deadly microbes, the researcher said.
"Our results present there has been solid adaptation in vultures when it concerns dealing v the toxic bacteria castle digest," Michael Roggenbuck, a researcher of microbiology in ~ the university of Copenhagen, claimed in a statement.
To sample the vultures" bacterial neighborhoods — referred to as microbiomes — the team captured and euthanized 26 black vultures (Coragyps atratus) and 24 turkey vultures (Cathartes aura) in Nashville, Tennessee. Autopsies and also DNA exam revealed the bacteria that live on the birds" faces and large intestine.
Like other vertebrates, vultures had much more types that bacteria ~ above their deals with than in their guts: 528 different types of microorganisms contrasted with 76.
The DNA that their food was broken down in the vultures" gut bacter samples, which argues the birds have actually harsh chemical problems in their gastrointestinal (GI) tracts, the researchers found. The acidic GI tract additionally filters out numerous microorganisms the live on disc carrion, so the big intestines have huge amounts of Clostridia and Fusobacteria.
"On one hand, vultures have actually developed very tough digestive system, which simply acts to damage the bulk of the danger bacteria they ingest," Roggenbuck said. "On the various other hand, vultures also appear to have occurred a yongin toward some of the deadly bacteria — varieties that would kill other animals actively seem to flourish in the vulture lower intestine."
Both Clostridia and Fusobacteria appear to have adapted to the vultures" harsh gut conditions, yet may also assist the bird by more breaking under nutrients, the researchers said.
The scientists also examined fecal samples indigenous captive turkey vultures and other birds, such together the red-tailed hawk and African spotted owl, at the Copenhagen Zoo. Return the zoo pets had similar diets, the fecal bacteria indigenous captive vultures more closely resembled the microbiomes of their brethren in the wild 보다 it did their avian relatives in the zoo, the researcher found.
The vultures" bacter similarities indicate that your digestive device has an ext influence top top gut bacteria 보다 diet does, the researchers said.
The findings imply the relationship between microbes and vulture digestion is more facility than previously thought, the researchers said.
"The avian microbiome is terra incognita, but it is not unreasonable to expect that the relationship between birds and also their microbes has been as necessary in avian evolution as the development of powered flight and song," claimed co-researcher Gary Graves, that the Smithsonian Institution"s national Museum of herbal History.
The study was released today (Nov. 25) in the newspaper Nature Communications.
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Laura is an editor at Live Science. She edits Life"s little Mysteries and reports on basic science, including archaeology and also animals. Her work-related has appeared in The new York Times, Scholastic, famous Science and Spectrum, a site on autism research. She has actually won multiple awards from the society of expert Journalists and the Washington Newspaper Publishers combination for her reporting at a weekly newspaper near Seattle. Laura hold a bachelor"s degree in English literature and psychology from Washington university in St. Louis and an progressed certificate in scientific research writing indigenous NYU.