In the fall, Rusty Blackbirds get new feathers with reddish-gold highlights that have a unique and subtle beauty. Their complex little song might sound like a door hinge that needs some grease. Though once common, Rusty Blackbirds have lost over 90 percent of their population since 1966 – one of the steepest declines of any North American bird species.

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To celebrate the season, Nancy Rumbel, who composed and played the BirdNote theme music, performs "Carol of the Birds." This version was arranged by Nancy herself, with the accompaniment of Pine Siskins, Black-capped Chickadees, a Red-winged Blackbird, Song Sparrow, House Finch, American Goldfinch, and Mourning Dove. Nancy plays the ocarina, oboe, bell, and harmonium. You can visit her website at nancyrumbel.com. Happy Holidays from all of us at BirdNote!

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A stiff December breeze blowing down the Columbia River delivers an exhilarating chill. A stretch of river near Bridgeport, in north-central Washington, is held tightly by a series of dams, creating massive lakes. High on an overlook, a Bald Eagle watches a flock of birds – coots, ducks, and more – on the water below.

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Songbirds delight us with their music, but at times they might sound repetitive. That’s because songbirds have to practice their singing to keep performing at their best. Researchers studying Zebra Finches found that females preferred the songs of males that had been practicing consistently compared to males that had taken a break from singing for a few days. So it seems that birds must keep their vocal muscles in shape to make sure everyone hears them loud and clear.

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The Northern Shrike breeds in the tundra and taiga of the north, but migrates south into the lower 48 for the winter. It has a pleasing and rhythmical song, which it sings even in winter. But its song belies a rather bloodthirsty feeding habit. The shrike impales its prey on sharp thorns or barbed wire, where it can pull it apart and consume it.

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Holiday cards often feature gorgeous red cardinals against a snowy landscape. So it’s easy to assume the birds have always been a colorful presence in bleak Northern winters. But cardinals used to be Southern birds. By the second half of the 20th century, though, they were nesting as far north as Maine, the northern Midwest, and even southern Canada.

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Hummingbirds such as this Buff-tailed Sicklebill specialize in nectar feeding. But other species of birds, less specialized to nectar, also visit flowers for a taste of the sweet stuff. The flowers they visit likely have a more open shape, with nectar more accessible to a non-specialist’s bill. The sugar they sample is probably different from what hummingbirds prefer. As flowering plants and birds co-evolved, each to benefit from the other, it seems likely that plants evolved the type of sugar best suited to the pollinators on hand. It's a win-win for all concerned.

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The Scaly-breasted Wren lives in Central and South America, and has a lengthy song of whistled notes separated by pauses. By analyzing song recordings, researchers found that Scaly-breasted Wrens can precisely measure out pauses  — even as they increase to several seconds. The findings suggest that the wrens have an internal metronome as accurate as a highly-trained musician playing a solo.

Listen to this show in Spanish here.

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Boreal Chickadees live in the boreal forest year-round. How do they survive the harsh winter? First, during summer, they cache a great deal of food, both insects and seeds. Then in fall, they put on fresh, heavier plumage. And their feathers are denser than most birds', creating a comfy down parka. Most impressive? The chickadees lower their body temperature at night from 108 degrees to just 85 degrees, conserving their stores of insulating fat. Hats off to the Boreal Chickadee, a truly rugged bird!

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In the boreal forest, winter temperatures routinely drop to 30 degrees below zero. Birds that spend the winter in this harsh domain rely on remarkable adaptations to survive. The Spruce Grouse is one such bird. Most Spruce Grouse remain here all year. In the snow-free summer, they forage on the ground, eating fresh greenery, insects, and berries. But in the snowy winter, the grouse live up in the trees, eating nothing but conifer needles. Lots and lots of needles. Because conifer needles are both low in protein and tough to digest, Spruce Grouse grow a bigger digestive system. A grouse's gizzard, which grinds food, may enlarge by 75%!

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You may have heard that feeding birds makes them dependent on humans for food, but it’s just not true. Even if you see your local birds ravenously eating at your feeder, those same birds are also finding wild sources of food from elsewhere at other times of the day. That being said, a humble bird feeder during a winter cold snap could really help out our feathered friends during a tough time.

BirdNote is supported by American Bird Conservancy, dedicated to conserving wild birds and their habitats throughout the Americas. Learn more at abcbirds.org

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