Bird Bathing

Click for more a larger view of a Northern Flicker and two American Robins at a bird bath.  Courtesy and Copyright 2012 Linda Kervin, Photographer

Two American Robins and a
Northern Flicker Drinking
Copyright © 2012 Linda Kervin

Click for more a larger view of three American Robins at a bird bath.  Courtesy and Copyright 2012 Linda Kervin, Photographer

Three American Robins Drinking
Copyright © 2012 Linda Kervin

No songbird can be led to water, and you certainly cannot make them drink. Give them a birdbath, though, and many birds will drink and bathe with gusto, especially here in the arid West. As a yard ornament the idea is not so old; the word “birdbath” was first coined in the Gilded Age. At our birdbath, robins daily crowd the rim, as many as six at a time, alternately bobbing and thoughtfully swallowing. Few birds can suck in water with their beak immersed. Instead, they lift their head with a beak full of water which they drink down in a few gulps. The gray Townsend’s solitaire, another regular visitor, perhaps needs to wash down its winter diet of dry, tangy juniper berries.

Birds like to bathe, even in winter. Just why they bathe is not so obvious. Cleaning their insulative layer of down may keep it fluffy to trap maximum heat. After bathing, birds often nibble their flight feathers. This preening removes dirt, feather detritus and parasites, while realigning each feather’s barbs so that they lock together for flight. Feathers repel water not by oils, but through their fine structure. Some game birds, such as quail, take dust baths, squatting in a shallow dirt scrape to ruffle loose dust through their feathers. When quail were experimentally denied dust baths, their plumage became greasy and disheveled. Bathed, preened birds are dapper.

So what features make a good birdbath? It should be shallow, just an inch or two deep and placed two feet or more above the ground to thwart terrestrial predators. A nearby preening perch is helpful. The bath should be convenient to refill, both because bathing birds splash a lot, and also because changing the water frequently deters disease transmission. Our birdbath mounts to our deck railing and has a low wattage heating element that prevents freezing. If you are already feeding birds, consider adding a birdbath. The exuberance of a bathing bird is a joy to behold.

This is Linda Kervin for Bridgerland Audubon Society.

Credits:

Graphics: Courtesy and Copyright 2012 Linda Kervin, Bridgerland Audubon Society

Text: Jim Cane, Bridgerland Audubon Society

Additional Reading:

Bird Notes from Sapsucker Woods, Cornell Lab of Ornithology, 2004, https://www.birds.cornell.edu/pfw/Members/BirdNote09–ProvideWater.pdf

Providing Water for Birds, Great Backyard Bird Count, Cornell Lab of Ornithology, https://www.birds.cornell.edu/bbimages/gbbc-email/ProvidingWater.pdf

Snow Pack Dynamics

Click for more information on Snow Layers. Graphic Courtesy Forest Service Avalanche Center www.fsavalanche.org
Snow Layers
Courtesy:
Forest Service Avalanche Center
Jim Conway, Graphic Artist
Formerly fsavalanche.org
See: https://avalanche.org/avalanche-encyclopedia/#snow-layer

Click for more information on Depth Hoar. Graphic Courtesy Forest Service Avalanche Center www.fsavalanche.orgDepth Hoar
Click to watch archived animation
Courtesy:
Forest Service Avalanche Center
Jim Conway, Graphic Artist
Formerly fsavalanche.org
See: https://avalanche.org/avalanche-encyclopedia/#depth-hoar-basal-facets

See Archived Avalanche Encyclopedia https://web.archive.org/web/20100312232112/http://www.avalanche.org/~uac/encyclopedia/

Water is our planet’s magical molecule, changing states faster than a presidential candidate. Snowpacks vaporize, ice melts and re-freezes, lakes evaporate, and cooled water vapor condenses back as clouds, snowflakes and hoarfrost. The muffled silence of the winter snowpack belies its dramatic pace of transformation.

In his book entitled “Life in the Cold”, author Peter Marchand explains the dynamic nature of the snowpack. Within a few hours after a snow storm, destructive metamorphism sets to work on the newly fallen snow. The delicate crystalline structure of each snowflake is quickly degraded. The intricate flakes transform to amorphous icy grains. Wind, warmth and compression accelerate destructive metamorphism, leaving a firmer, denser snowpack. At the surface, not only does snow strongly reflect the weak warmth of winter sunlight, but on a clear night, it radiates energy, greatly cooling the surface.

Meanwhile, the soil beneath the snowpack is typically warmer than the overlying snow, which is why springs can run all winter long. Three feet underground, soil temperature is within a few degrees of that location’s average annual air temperature. Sandwiched between the warm soil and the cold air, the blanket of snow is a great thermal insulator; fresh snow is the equal of fiberglass insulation. As a result, soil warmth transforms snow deep under the snowpack into water vapor. This moisture spreads through air spaces in the snowpack, following the thermal gradient to the chilly snow surface. As the moisture vacates the lower layers, a brittle porous layer develops in the snowpack. Termed “depth hoar”, it is weak, icy and prone to collapse. When the heavy overlying snowpack shifts, the crumbly depth hoar can release an avalanche, a powerful reminder of snowpack transformations for any backcountry traveler.

Come spring, every particle of Utah’s snowpack undertakes its final transformation. Some sublimates to waft away on warm springtime winds. Most of it melts away to feed the groundwater, springs and streams that give us cool relief on a hot summer day and provide the precious water that every Utahn depends on.

This is Linda Kervin for Bridgerland Audubon Society.

Credits:

Graphics: Courtesy Forest Service Avalanche Center, https://www.fsavalanche.org/
Text: Jim Cane, Bridgerland Audubon Society

Additional Reading:

Life in the Cold by Peter Marchand:https://www.upne.com/9619460.html

Forest Service National Avalanche Center, Avalanche Awareness Website: https://www.fsavalanche.org/

Depth Hoar: https://www.fsavalanche.org/encyclopedia/depth_hoar.htm

Utah Avalanche Center: https://utahavalanchecenter.org/

Peregrine Falcons: Fierce predators rescued from the abyss

Peregrine Falcons: Fierce predators rescued from the abyss: Falco peregrinus, Tooele County, Utah, 21 Jun 2009. Photo Courtesy & Copyright Kent R. Keller and found on utahbirds.org
Peregrine Falcon, Falco peregrinus
Tooele County, Utah, 21 Jun 2009
Courtesy & Copyright © Kent R. Keller
from Utahbirds.org

PeregrinePeregrine Falcon
Courtesy US FWS
Frank Doyle, Photographer

Click to view larger image of a Peregrine Falcon in Flight. Courtesy US FWS, Katherine Whittemore, PhotographerPeregrine Falcon in Flight
Courtesy US FWS
Katherine Whittemore, Photographer

What predatory bird can guide a screaming 200 MPH freefall dive to intercept a flying duck, killing it with a blow from a fist of talons? Tornado winds howl at 200MPH. Even flying horizontally, this bird can accelerate to 70MPH. No animal is faster. It must therefore be a falcon, in today’s case, the Peregrine Falcon. This species inhabits all continents but Antarctica. The Peregrine likes cliff ledges for nesting, such as the high basalt walls at the Birds of Prey Refuge along the Snake River near Boise. In such places, listen for its call, which is very similar to this Prairie Falcon:

Kevin Colver recording: Songbirds of the Southwest Canyon Country

Fifty years ago, the Peregrine Falcon was in a different dive, a plunge to extinction. The culprit was DDT. It wasn’t poisoning the birds, but it insidiously interfered with birds’ calcium metabolism, leaving thin-shelled eggs that broke under brooding parents. DDT is persistent. Worse, DDT bioaccumulates in fats of species high on the food chain, birds like falcons, eagles, and pelicans. Robins provided the first persuasive evidence of DDT bioaccumulation.

On December 28, 1973, President Nixon signed the Endangered Species Act into law. The peregrine falcon was immediately listed. DDT use in the United States was banned. Worried wildlife researchers undertook a bold program to rescue intact eggs from cliff-face nests. The captive nestlings were raised up and taught to hunt. Over the years, 1600 peregrines were released into the wild. The peregrine’s population plunge was halted, then reversed. In 1999, it was formally delisted. By 2003, 3000 pairs bred in Canada, the U.S. and Mexico. Peregrines have never been common, but today, you are four times more likely to see a Peregrine Falcon in Utah than 30 years earlier. You can see similar rebounds in Red-tailed Hawks, Brown Pelicans and other predatory birds by going to the website of the National Audubon Christmas bird counts. This is an environmental success story worth celebrating.

This is Linda Kervin for Bridgerland Audubon Society.

Credits:

Photo: Courtesy & Copyright Kent R. Keller and

Courtesy images.fws.gov

Text: Jim Cane, Bridgerland Audubon Society

Bird Recordings Courtesy and Copyright Dr. Kevin Colver,https://wildstore.wildsanctuary.com/collections/special-collections & WildSanctuary, Soundscapes, https://www.wildsanctuary.com

 

Additional Reading:

Peregrine Falcon (Falco peregrinus), U.S. Fish & Wildlife Service, May 2006, https://library.fws.gov/ES/peregrine06.pdf

Christmas Bird Count, National Audubon Society, https://birds.audubon.org/christmas-bird-count

The Birder’s Handbook: a field guide to the natural history of North American birds : including all species that regularly breed north of Mexico [Book] by Paul R. Ehrlich, David S. Dobkin, Darryl Wheye
https://www.amazon.com/Birders-Handbook-Natural-History-American/dp/0671659898

Feathers: The Evolution of a Natural Miracle, Thor Hanson, Illustrated. 336 pages. Basic Books.
https://www.amazon.com/Feathers-Evolution-Natural-Thor-Hanson/dp/0465028780/

Salt Lake City Peregrine Falcon Cameras, Wildlife.utah.gov, https://wildlife.utah.gov/dwr/learn-more/peregrine-cam.html

Lewis and Clark’s Taxonomic Legacy

Clark’s Nutcracker
Courtesy US FWS
Dave Menke, Photographer

Lewis’s Woodpecker
Courtesy US FWS
Dave Menke, Photographer

Thomas Jefferson will forever be remembered as our third president and author of the Declaration of Independence. Jefferson oversaw the acquisition of the vast Louisiana Purchase and soon thereafter initiated planning for an expedition that would be named the “Corps of Discovery”. That bold adventure was led by Meriwether Lewis and William Clark. These two frontiersmen are immortalized by the plants and animals that taxonomists named in their honor.

The arduous 3-year expedition route passed far north of what would become Utah, ascending the tributaries of the Missouri River and later following down the Columbia River to the Pacific Ocean. Jefferson, being an avid naturalist, instructed the explorers to observe and make record of the geography, plants and animals that they encountered and to return with those specimens which they could carry. Hopes for discovery of a navigable inland passage to the Pacific were not realized, but in all other ways, the expedition was a singular success.

Lewis and Clark made collections of pressed plants along the way. These eventually went to Frederick Pursh, a German botanist in Philadelphia. One new genus of plant he named Lewisia. These are the bitteroots, one of which is the spectacular state flower of Montana. Another genus new to science he named Clarkia . Many species names of plants immortalize the men too, such as the blue-flowered flax, Linum lewisii, commonly used today for seeding following wildfire.

Bird names honoring the discoveries of Lewis and Clark include Clark’s nutcracker and Lewis’ woodpecker. Clark’s nutcracker is a big black and gray relative of crows. [https://wildstore.wildsanctuary.com/collections/special-collections, https://wildstore.wildsanctuary.com/collections/special-collections] This noisy resident of Utah’s mountains is notable for its habit of caching seeds of pine trees to be remembered and found months later.

The age of the pioneer naturalist in North America closed more than a century ago, but the names of men like Meriwether Lewis and William Clark live on with the plants and animals that bear their names.

This is Linda Kervin for Bridgerland Audubon Society.

Credits:

Images: Courtesy US FWS images.fws.gov
Audio: Courtesy & Copyright https://wildstore.wildsanctuary.com/collections/special-collections, https://wildstore.wildsanctuary.com/collections/special-collections
Text: Jim Cane, Bridgerland Audubon Society

Additional Reading:

The Lewis and Clark Herbarium, Images of the Plants Collected by Meriwether Lewis and William Clark, 1804-1806, Presented by the University of Maryland and The Academy of Natural Sciences in Philadelphia in cooperation with Cornell University, https://www.plantsystematics.org/reveal/pbio/LnC/LnCpublic.html

Evans, Howard Ensign. 1993. Pioneer naturalists: the discovery and naming of North American plants and animals. Henry Holt & Company, New York. Illustrated by Michael G. Kippenhan. ISBN: 0-8050-2337-2, https://www.amazon.com/Pioneer-Naturalists-Discovery-American-Animals/dp/0805023372

And for a thorough treatment of Clark’s nutcracker:

https://en.wikipedia.org/wiki/Clark%27s_Nutcracker

All About Birds, The Cornell Lab of Ornithology:

https://www.allaboutbirds.org/guide/lewiss_woodpecker/id

https://www.allaboutbirds.org/guide/Clarks_Nutcracker/id