18,000 years later: Extinct bird species returned for the second time. The Aldabra white-throated rail (Dryolimnas cuvieri aldabranus) is the only living, flightless bird in the Indian Ocean.
Scientists suspect that the birds became heavier over time and thus lost their ability to fly. This bird species, which was thought to be dead, has been rediscovered - after 140 years - in the Seychelles archipelago.