Such cases are very rare.
British paleontologists have discovered in the Seychelles supposed to be extinct wingless birds kaviarov, thousands of years later again settled in the Aldabra Atoll, reports the Chronicle.info with reference to lenta.ua.
This large Atoll emerged about 400,000 years ago and survived at least six dives in the depths of the Indian ocean. Then the water receded and the cap of the Atoll again became habitable. The last flood occurred 136 000 years ago, killing all who could not fly and swim the fauna of the island. Recently, however, on Aldabra, researchers from Portsmouth University and London’s natural history Museum found dryolimnas cuvieri — white cowgirl — small bird, it seemed, forever disappeared after the next global warming.
An attempt to answer the question of how it became possible, resembles a detective story. The fact that the boy was once able to fly and migrated in ancient times from Madagascar to the Aldabra Atoll, where we almost did things predators. Feeling safe, the bird relaxed and… forgotten how to fly. Which was tantamount to a death sentence when submerged the island under water.
Approximately 100,000 years ago, the Atoll once again “emerged” from the depths of the sea and relatives-cowgirl Madagascar secondarily colonized Aldabra. This is a natural process when colonies of birds suffer from overpopulation, some of them are forced to colonize nearby Islands. But the most interesting thing in the evolution of dryolimnas cuvieri again lost the ability to fly! That we are talking about the same “extinct” form became clear when the researchers compared the fossils of ancient shepherds (in particular, the Tarsus — the lower leg bone) with the skeletons of their modern relatives.
“These fossils prove conclusively that one of the winged types of dryolimnas cuvieri, inhabiting Madagascar, twice colonized Aldabra Atoll twice and evolved into wingless creature, explains researcher of the London Museum of natural history Julian Hume. Is a rare case of iterative evolution — development of similar species from the same ancestor, but in different time periods”.
To date, the cowherd boys from the Aldabra Atoll — the last flightless bird of the Indian ocean.
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Unfortunately, a similar case of revival of extinct species is unique, and the General trend is the reverse. Over the last three centuries mankind has lost about 80 species of birds already in the XXI century, recognized as extinct carnality Hawaiian flower girl, spotted green pigeon and a tiny toadstool, who lived, incidentally, in Madagascar.