BirdNote Daily

Smaller than a pigeon — but fierce enough to knock one from the air — are the powerful, compact falcons known as Merlins. Climate change is pushing ranges of many birds farther north, but more and more Merlins have been nesting farther south, in towns and cities across the northern United States. Merlins will take over old crow nests, especially in conifer trees, in parks, cemeteries, and neighborhoods.
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This Bar-tailed Godwit makes one of the longest migrations of any animal — a 7,200-mile non-stop flight each autumn from western Alaska to New Zealand. In his book A World on the Wing, Scott Weidensaul explores the remarkable transformation godwits undergo to make this migration possible. Their digestive organs shrink as their weight more than doubles in stored fats and muscle mass.
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When you think of bird migrations, you might think of a bluebird or a robin first. But some owls do migrate – such as the Short-eared Owl, which flies south for the winter. Northern Saw-whet Owls were once thought non-migratory, but in fact they travel at night, unseen. Snowy Owls breed in the Arctic then wander toward the south, staying wherever they can find food. Some Burrowing Owls spend their whole life in one place. But others migrate every spring and fall with the regularity of a bluebird.
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Biologists with Manomet tagged a Whimbrel named Lindsay with a GPS tracker. She has spent the summer breeding in the Arctic National Wildlife Refuge on the northern coast of Alaska. As fall migration begins, she heads straight into a storm in the Gulf of Alaska. The tempest slingshots her toward British Columbia, where she picks up a tailwind down the California coast. Landing near San Francisco, she rests and refuels.
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In the October sunlight, a Lincoln's Sparrow – like this one – sings energetically from a hedgerow. Soon a Fox Sparrow chimes in. Both nested in Alaska last summer but will spend the winter farther south. The Snow Geese are moving, too. A massive movement of birds takes place in the fall. The exodus of summer visitors to the tropics has given way to a surge from the north. And predators can't be far behind.
More info and transcript at BirdNote.org.
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