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This bird has become a being twice – thousands of years



  This bird evolved twice - thousands of years

Yellow White Grid ( Drillimas Cuvier )

Credit: Sharpe [CC BY-SA 4.0]

The Indian Ocean, a bird species, evolved to be non-flying ̵

1; twice.

Some hundreds of thousands of years ago, white grids ( Dryolimnas cuvieri ) flew from their native home in Madagascar to the Aldabra atoll. – a reef reef in the Seychelles. The reef, free of bird predators, was a convenient place to call home – and over time rails lost their ability to fly.

But the crash struck an estimated 136,000 years ago when a large tide captured the atoll. and non-birds – under the waters of the Indian Ocean leading to the extinction of birds. [Photos of Flightless Birds: All 18 Penguin Species]

But not everything was lost: About 36,000 years later, when the world was in the ice of an ice age, the sea levels fell and the atoll appeared again on the surface of the water. And after some time something familiar happened: the dark white rails receded again from Madagascar and flew to the atoll. Once again, birds are again evolving from their ability to fly.

This means that a single species, the white neck, evolved to twice without flight – a phenomenon known as "iterative evolution", according to a statement by the University of Portsmouth

Scientists at the University of Portsmouth and the Natural History Museum, both in the UK, came to this conclusion by comparing the bones of the ancient Aldabra rails-like those that existed before and after the flood-to newer birds. This includes the more modern bones of flying rails and flights without aldabs (19459013) still living on the atoll today.

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Credit: Julian Hume

The team found that the bones of the Aradra rails that date back to the flood are very similar to Aldabra's modern iron bones. , the researchers found that the bones of the wing and ankles date back to about 100,000 years ago, or around the time when the birds flew back to the atoll after the flood, showed evidence that the animals are developing to be untreated. stronger than the same flying bird's ankle, suggesting that birds are getting heavier and lose their ability to fly, according to the National Museum of History in the United Kingdom

. irrefutable evidence that a railroad family member colonizes the atoll, most likely from Madagascar, and has become unnoticed individually each time, "said lead researcher Julian Hume, a bird paleontologist at the Natural History Museum

why these rails leave Madagascar first , is still not clear. But every 50 to 100 years, factors such as overcrowding or a reduction in food supplies trigger the mass migration of birds from Madagascar in all directions through the Indian Ocean, according to the National Museum of History.

Researchers publish their results on May 8th at the Zoological Journal of the Linnean Society

Initially published on Live Science .


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