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When we watch birds in flight, they’re often seen against a backdrop of clouds. Clouds have many different types and are listed in the International Cloud Atlas. The asperitas cloud was first described by citizen-scientists and has now been incorporated into the official atlas. More info and transcript at BirdNote.org. Want more BirdNote? Subscribe to our weekly newsletter. Sign up for BirdNote+ to get ad-free listening and other perks. BirdNote is a nonprofit. Your tax-deductible gift makes these shows possible. |