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Podcast: BirdNote
Episode:

Alpine Swifts Fly Nonstop
Category: Religion & Spirituality
Duration: 00:00:00
Publish Date: 2019-01-02 02:00:00
Description: How long can a bird fly without touching the earth? To find out, Swiss scientists attached sensors to Alpine Swifts. The sensors showed long periods when the swifts were gliding and not flapping their wings. Were the birds asleep? Scientists don’t know for sure.
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