The Aldabra Rail is the only living flightless bird in the Indian ocean. The atoll was submerged 118,000 years ago rendering the Aldabra Rail extinct. When the atoll resurfaced, so did the Aldabra Rail-this time as a flying version. Living on the atoll this species of bird becomes flightless over time. The Aldabra Rail evolved twice, both times becoming extinct, the resurfacing with similar traits as before.