Over 130,000 years ago, White-throated Rails migrated across hundreds of miles from Madagascar to the tiny island of Aldabra. Fossil records show that these wayward birds evolved to be entirely flightless, and went extinct when the island was lost to sea level rise. But some 20,000 years later, Aldabra reemerged from the Indian Ocean and a new wave of rails settled in. Today, the Aldabra subspecies of White-throated Rails are flightless once again! It’s a rare example of a phenomenon called iterative evolution.

More info and transcript at BirdNote.org.

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