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