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Podcast: BirdNote
Episode:

Sleeping on the Wing
Category: Religion & Spirituality
Duration: 00:00:00
Publish Date: 2019-01-20 02:00:00
Description: Some swifts and frigatebirds stay aloft for months. But for a long time, scientists did not know if the birds might be sleeping on the wing. A 2016 study provided answers.
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