We're used to birds migrating north to south and south to north. But the Ancient Murrelet migrates east to west and back across the North Pacific. These plump seabirds nest in colonies in old-growth forests, in burrows and rock crevices. But where do they go in winter? After breeding, many Ancient Murrelets migrate westward. Around November, they end up in the Yellow Sea or the Sea of Japan. Two months after that, they head back, reaching British Columbia in March, and the cycle begins anew.

More info and transcript at BirdNote.org. 

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