Each morning, Sara Barker wakes before dawn, covers herself with camouflage and makes sure she has her compass before heading into the eastern Arkansas swamps. Her quest: the elusive ivory-billed woodpecker.

Dozens of birders have flocked to the wildlife refuges of the Arkansas Delta to follow up on a kayaker’s 2004 sighting of a bird so rare it was thought to have become extinct. They hope to obtain a clear video or picture of the bird and then study its behavior.

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