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Golden Eagle at Swan Falls Photo credit: USDOT FHA America's Byways
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Submitted by: Mark Miller
With a wingspan of more than seven feet, the golden eagle is
North America’s largest bird of prey. They get their name from the golden
feathers on the back of their head and neck.
In contrast to their cousin, the bald eagle, golden eagles prefer less
forested, more open habitat and avoid developed areas. They find this habitat
in central and eastern Washington. Their most common prey are small to medium-sized
mammals including black-tailed jackrabbits, ground squirrels and yellow-bellied
marmots. Golden eagles will also take
birds, larger mammals, fish, reptiles, and domestic livestock and feed on carrion
(dead animals). However, golden eagles show a strong preference for
jackrabbits, even when jackrabbit populations are low. In fact, golden eagle populations in some
parts of the U.S. have a tendency to cycle on a 10-year basis with jackrabbit
populations.
Any real estate agent will tell you the three most important
factors for buying a home are LOCATION, LOCATION, LOCATION. This holds true for golden eagles. The ideal nesting home site for a golden
eagle pair is a cliff or large tree in a quiet neighborhood, close to the
grocery store (hunting grounds), with a panoramic view of their environs. Golden eagles are less gregarious than bald
eagles, so you will rarely see them in large concentrations. They range from the arctic to the desert
southwest and are more common west of the Mississippi, although they do occur
in the eastern United States.
Population trends for golden eagles have been difficult to
determine due to a lack of long-term monitoring studies of golden eagle
abundance in the United States prior to 2003.
There is a general consensus that golden eagle populations are declining
in many areas due to the usual cast of suspects: loss of habitat, reduction in prey
particularly jackrabbits, collisions with vehicles, wind turbines or other
structures, electrocution at power poles, intentional and unintentional poisoning
and climate change.
Habitat loss comes from a variety of sources. As human activity and development increase,
pressure is put on golden eagles.
Urbanization, agriculture, mining and wind farms can reduce golden eagle
habitat. Exotic plant species invading
native shrub steppe habitat in eastern Washington can increase the frequency
and intensity of wildfires and cause negative effects to the plant community
and to jackrabbit populations that golden eagle depend. Non-native cheatgrass is the chief
culprit. Climate change might also contribute
to current and future negative effects to golden eagles, particularly in
semi-arid and arid ecosystems.
Golden eagles are also being poisoned from ingesting fragments
of lead shot or bullets from hunter- killed animals, particularly deer, ground
squirrels, upland game birds and waterfowl.
Even tiny amounts of ingested lead can have fatal effects on eagles. Switching to non-toxic copper bullets can
reduce lead poisoning in golden eagles. (http://www.nps.gov/pinn/naturescience/upload/USGS_lead_poisoning_wild_birds_2009.pdf)
Golden eagles are protected by the Migratory Bird Treaty Act
in North America and the Bald and Golden Eagle Protection Act (BGEPA) in the
U.S. BGEPA prohibits “take” of eagles
without a permit. “Take” includes
pursuing, shooting, shooting at, poisoning, wounding, killing, capturing, trapping,
collecting, molesting or disturbing. The BGEPA prohibits “take,” or any of
these actions, on individuals, their parts, nests or eggs. (http://www.fws.gov/midwest/midwestbird/eaglepermits/bagepa.html)
The U.S. Fish and Wildlife Service has provided funding to
the Washington Department of Fish and Wildlife (http://wdfw.wa.gov/)
to locate and monitor known nesting territories in Washington during the 2013
breeding season. Completion of this
study will give us valuable information regarding the number of territories
occupied and the number of young golden eagles produced.