How the Yellow-rumped Warbler Survives Northern Winters
While most wood warblers head south to warmer climes, 'butterbutts' hunker down for the long, cold haul.
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This is BirdNote!
Vermont field naturalist and writer, Bryan Pfeiffer, writes today鈥檚 story:
It鈥檚 an aster in winter, sun through the clouds 鈥 a force of nature called the Yellow-rumped Warbler. Discover this songbird's buttery warmth, even when life outside seems to groan or crunch or crack in the cold.听
By now most warblers have migrated south. But the Yellow-rumped Warbler, which birders affectionately call 鈥渂utterbutt鈥 is a lesson in adaptation.
In winter, when most of their kin are enjoying insects in the tropics, Yellow-rumps are finding food across parts of the West, the southern U.S. and north into New England. With insects in short supply, the Yellow-rump turns to fruit: juniper, viburnums, and mountain ash.听
But this warbler鈥檚 greatest dietary feat is that it also eats the fruits of bayberry and wax myrtle 鈥 the raw materials of folksy candles. Digesting wax takes guts 鈥 literally. To do so, it appears that Yellow-rumps possess elevated levels of bile salts, which aid digestion of saturated fats.听
The Yellow-rump鈥檚 gastrointestinal talents probably account for its ability to inhabit a winter range farther north than its relatives. Particularly along the Atlantic coast, [where wax myrtle and bayberry can be abundant] birders, in a day, might find butterbutts in the hundreds 鈥 abundance unlike any wintering warbler in North America.听
You can share this show with a friend when you come to birdnote.org.听
This is BirdNote!
Vermont field naturalist and writer, Bryan Pfeiffer, writes today鈥檚 story:
It鈥檚 an aster in winter, sun through the clouds 鈥 a force of nature called the Yellow-rumped Warbler. Discover this songbird's buttery warmth, even when life outside seems to groan or crunch or crack in the cold.听
By now most warblers have migrated south. But the Yellow-rumped Warbler, which birders affectionately call 鈥渂utterbutt鈥 is a lesson in adaptation.
In winter, when most of their kin are enjoying insects in the tropics, Yellow-rumps are finding food across parts of the West, the southern U.S. and north into New England. With insects in short supply, the Yellow-rump turns to fruit: juniper, viburnums, and mountain ash.听
But this warbler鈥檚 greatest dietary feat is that it also eats the fruits of bayberry and wax myrtle 鈥 the raw materials of folksy candles. Digesting wax takes guts 鈥 literally. To do so, it appears that Yellow-rumps possess elevated levels of bile salts, which aid digestion of saturated fats.听
The Yellow-rump鈥檚 gastrointestinal talents probably account for its ability to inhabit a winter range farther north than its relatives. Particularly along the Atlantic coast, [where wax myrtle and bayberry can be abundant] birders, in a day, might find butterbutts in the hundreds 鈥 abundance unlike any wintering warbler in North America.听
You can share this show with a friend when you come to birdnote.org.听
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Bird sounds provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York. Calls of Yellow-rumped Warbler [135402] recorded by M. Andersen; calls of Yellow-rumped Warbler [ 107591] recorded by D.S. Herr.
BirdNote鈥檚 theme music was composed and played by Nancy Rumbel and John Kessler.
Wind Nature Essentials #02 recorded by Gordon Hempton, of QuietPlanet.com
Written by听Bryan Pfeiffer, and adapted from听鈥淭he Winter Warbler.鈥 Visit Bryan's blog at听.
颁谤别诲颈迟蝉:听
Bird sounds provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York. Calls of Yellow-rumped Warbler [135402] recorded by M. Andersen; calls of Yellow-rumped Warbler [ 107591] recorded by D.S. Herr.
BirdNote鈥檚 theme music was composed and played by Nancy Rumbel and John Kessler.
Wind Nature Essentials #02 recorded by Gordon Hempton, of QuietPlanet.com
Written by听Bryan Pfeiffer, and adapted from听鈥淭he Winter Warbler.鈥 Visit Bryan's blog at听.
Narrator: Michael Stein
Producer: John Kessler
Executive Producer: Chris Peterson
漏 2016
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