Fascinating story on one of our Baja birds

 

Whimbrel

Too cold to bird outside in the Northwest today so I did a little birding inside, playing catch up on my reading, which consists of, yeah, you guessed it….birding magazines.  When I got to my Audubon magazine, I was so enthralled with this article on one of our Baja birds, the Whimbrel, that I thought I must share it with you.  I hope you enjoy it as much as I.  I will give you a few “Whimbrel facts” before the story which can be read in it’s entirety at http://www.audubonmagazine.org/articles/birds/unlocking-migrations-secrets

The Whimbrel is one of the most widespread of the curlews.  Adults are very defensive of their nesting area and will attack humans who come too close.  Some migrating birds make a nonstop flight of 2500 miles from southern Canada or New England to South America.

Wingspan Range: 31-33 inches

Breeding:  Breeds in the Arctic and winters in Africa, southern North America, South America, and south Asia.  Preferred habitats include tundra, marshes, prairies, shorelines, and mud flats.

Foraging and Feeding:  Feeds on insects, snails, slugs, crabs, shrimp, mollusks, and worms.  Probes deeply into mud and moves as it feeds.  Also picks off food found on the ground.  Sometimes takes large prey, tearing it into pieces small enough to eat.

I was also fascinated to learn that prior to 200 B.C., the Romans transmitted messages by tying them to a swallow’s foot.  The earliest known instance of this appears during the Second Punic War (218-201 B.C.)  In 1595 the earliest record of a metal band being attached to a bird’s leg:  Henry IUV’s tagged peregrine falcon, lost in France, shows up 24 hours later in Malta, about 1,350 miles away.

I’ve often wondered about this tagging and attaching geolocators.  Wondering if our whales, sharks, birds, etc. are aggravated by it.  Does it interfere with their day to day life and their very existence?  Is it a trade off to gain the knowledge of their migrations?  In Lake Tahoe one year, I saw a foot tag on a Canada goose that caused it to limp around and not behave normally.  This kind of set in my mind as I really didn’t like this tagging thing but here I am….so enthralled with this information from this practice that I had to share it with you!  I just don’t know…..I’ll keep thinking on it and weighing the pros and cons in my mind.  I wish the birds and the animals could talk.  I mean…where’s Dr. Dolittle when you need him???!

UNLOCKING MIGRATION’S SECRETS

FOR CENTURIES THE STUDY OF BIRD MIGRATION HAS BEEN RIDDLED WITH MYSTERY AND UNANSWERED QUESTIONS: WHERE DO BIRDS GO IN WINTER? HOW FAR DO THEY FLY? CAN THEY NAVIGATE A HURRICANE? SCIENTISTS ARE TAPPING NEW TECHNOLOGIES TO FIND THE ANSWERS, AND TRANSFORMING EVERYTHING WE KNOW—OR THINK WE KNOW—ABOUT BIRDS.

BY SCOTT WEIDENSAUL/PHOTOGRAPHY BY JOEL SARTORE
Published: March-April 2012

Last August a female whimbrel took off from the treeless tundra of Southampton Island, which guards the iceberg-choked entrance to Hudson Bay in the Canadian subarctic, and set a course southeast.

Long-limbed and gray-brown, she was the size of a small duck, bearing the field marks that make this shorebird instantly identifiable—dark stripes on the crown of her head, and a long, thin, drooping crescent of a bill. It gives the whimbrel its genus name: Numenius, Greek for “new moon.”

Southampton had merely been a way station for her; some weeks earlier she had arrived there from her breeding grounds on the Mackenzie River delta in the Northwest Territories, some 1,500 miles and 52 hours of flying time to the northwest. Now her bill was stained purple from weeks of gorging on the autumn tundra’s bounty—blueberries, crowberries, and cloudberries, all of which her body had converted to thick layers of fat, fuel for the incredible journey ahead.

Tapered wings pumping without pause or rest, she flew east across Hudson Bay, passing thereafter over the rugged Ungava Peninsula of northern Quebec, then above the trackless boreal forests and wild rivers of Labrador. After 1,500 miles of unbroken flight, averaging 43 miles per hour, she left land behind, flying out into the open ocean somewhere south of Newfoundland.

 

Connectivity Map

Illustration by Peter Hoey
High Hope: A Whimbrel’s Migration

 

It was here that she ran into trouble. Her flight path brought her into the remnants of Tropical Storm Gert, which was roiling its way up the north Atlantic. Fighting ferocious headwinds, the bird struggled to stay aloft as she plowed ahead at a painful crawl; for the next 27 hours her average ground speed slowed to a mere nine miles an hour.

Finally she broke through to the storm’s far side. Now, with the gale at last at her back, she rocketed along at 92 mph. In little more than 90 minutes she flew 150 miles to make landfall at Cape Cod—her first rest since she’d taken off from Southampton Island four days and 2,325 miles earlier.

That we know about this migratory drama at all, much less in such extraordinary detail, is thanks to a small satellite transmitter nestled among the feathers on the whimbrel’s back—part of a transformation in wildlife tracking that is making it possible for scientists to understand the movements of migratory animals with a level of precision unimaginable even a few years ago. They can comb through the chemical isotopes in a bird’s feather and learn where it spent the winter, sift the DNA in its genes to tease out how migratory populations are related to one another, attach minute devices that faithfully record its location for years at a stretch by just observing the time the sun rises and sets each day, or track threatened eagles in the Appalachians by tapping into the ubiquitous cell phone network (and thus help planners avoid conflicts with new wind farms). They have found that neighboring populations of the same species may take wildly different routes to far-flung wintering areas, and that many birds show an almost incomprehensible degree of fidelity to particular stopover and wintering sites.

With that new knowledge has come a recognition of what we’ve badly underestimated: the profound, almost universal role that migration plays in virtually every aspect of a wild bird’s life—and, with it, a new effort by dozens of researchers, agencies, and organizations like Audubon to better map these movements, better understand their significance, and harness this greater understanding for the benefit of birds.

“This new generation of telemetry has enormous potential for understanding bird biology and conservation,” says Steve Kress, Audubon’s vice president for bird conservation, and the founder of Project Puffin. “The new data loggers and transmitters could be far more important than bird bands, and future ornithologists may someday think of placing metal rings on bird legs as being as primitive as we might think of John James Audubon’s method of tying a silver thread to a phoebe leg. This is because these new devices give us the ability to track individual birds throughout the year—something that a band was never intended to do.” (To learn about the migratory secrets of some other individual species, from long-tailed ducks to pink-footed shearwaters and golden eagles, go to audubonmagazine.org.)

But by lifting the veil that has masked much of where and when birds travel, conservationists not only realize how little they know about migration. They’ve also learned, sometimes to their grief, that they have badly underestimated, too, the dangers facing these global wanderers—birds like the whimbrel named Hope.

This article also left me wondering about the pattern of this migration shown in the illustratiuon above.  Note that the 2010 Fall Migration differs from the 2009 Fall Migration.  Why did the Whimbrel not stop in Virginia in 2009 like it did in 2010?  Weather?  What are your thoughts?  Has anyone seen a Whimbrel in our Baja birding areas?  We haven’t yet and therefore, no photo!

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