Showing posts with label Golden eagles. Show all posts
Showing posts with label Golden eagles. Show all posts

Monday, August 15, 2016

Celebrating the Centennial! 100 years of Bird Conservation

On this date in 1916, the first Migratory Bird Act was signed between the United States
and Canada, serving as the catalyst for a century of bird conservation actions. At the turn of the twentieth century, bird populations were in peril as a result of unregulated shooting for the food and fashion industries. Recognizing the need for collaboration to protect species that traverse their borders, partners in the United States and Canada drafted an agreement to cooperatively manage and protect birds that migrate internationally. The act was the first international agreement forged to protect wild birds, and among the first to protect any wildlife species.

Mom and Dad Decorah don't migrate, but many of the birds we watch do! D1 went to Canada for the summer, while many of Eagle Valley's eagles visit the United States for the winter. North American peregrine falcons have been reported on oil rigs in the Gulf Coast (Candace W/Z, a bird that Bob banded), Chile (the incredible Island Girl), and Costa Rica (the lovely Inmaculada), just to name a few. As Scott Weidensaul says: "At whatever moment you read these words, day or night, there are birds aloft in the skies of the Western Hemisphere, migrating. If it is spring or fall, the great pivot points of the year, then the continents are swarming with billions of traveling birds..."

It is August 15th. Grasshoppers are leaping, goldenrod is blooming, indigo buntings are visiting my feeders, and some of the birds that summer in Minnesota and parts north will begin migrating soon. A great tide of birds will wash down from the north, moving down the Mississippi river towards the southern US, the Caribbean, Mexico, and Central and South America. They will fly over cities, counties, states, provinces, precincts, districts, and nations - a patchwork of histories, languages, cultures, religions, economies, shared experiences, and beliefs - with no passport or knowledge of boundaries other than those imposed by landscape and weather. What has that tiny indigo bunting at my feeder seen? How many miles have passed beneath its wings? What is it like to be an artic tern, which flies about 44,000 miles per year and experiences nearly perpetual daylight as it travels from Greenland to Antarctica and back again? What pulled D1 north 920 miles to Hudson's Bay every summer and what did it feel like when the fishhook of dispersal started tugging her away from the only world she had ever known?

There are a lot of reasons that birds are important. They connect people with nature, which gives us a reason to preserve the landscapes they need. They contribute important environmental benefits, including insect and rodent control, pollination, and seed dispersal. They are an important part of our economy, generating about $500 million annually in direct hunting revenue in my home state of Minnesota alone - and that doesn't count the money spent by birds, bird banders, and people who attend birding festivals. But to me, the most fascinating part of birds will always be their mystery. I am grateful for the window into their world that technology has given us, and for treaties like the Migratory Bird Act to help protect them as they wing their way through our world.

A brief history of three Acts that protect Bald Eagles
The ornamental plume trade provided the catalyst for two of the three Acts that protect bald eagles. In the late 1800s and early 1900s, hats decorated with plumes and other bird parts were a must-have for fashionable ladies. How bad was the plume trade? In February 1886, a young New York ornithologist named Frank Chapman set out on expedition to uptown Manhattan, counting the number of ladies' hats adorned with feathers and other bird parts. Over the course of two trips, Chapman counted 542 hats adorned with 174 whole birds or their disembodied parts. In Chapman’s assessment forty different bird species were represented in his count. As Lapham's Quarterly pointed out, this made uptown Manhattan one of the most diverse bird-watching territories in the world. It is estimated that over 5,000,000 birds were being killed annually to decorate hats and clothing.

Hats decorated with ornamental plumes were a must-have for fashionable ladies! 
Woman wearing a "Chanticleer" hat 
made of bird feathers, circa 1912.
Opera singer Emmy Destinn 
wearing a plume-covered hat, around 1909.

The Lacey Act and the Migratory Bird Treaty Act were passed largely to regulate and combat the ornamental plume trade, which decimated bird populations and drove a number of species to extinction. The Lacey Act, passed in 1900, was the first federal law protecting wildlife. It prohibited market hunters from selling poached game across state lines and was designed in part to stop the flow of feathers from the American countryside to the great millinery centers of New York and London. Iowa fans can be especially proud, since the Act was introduced by Iowa Congressman John Lacey.

The Migratory Bird Act was a landmark agreement signed by the United States and Great Britain in 1916 with the goal of 'preserving those species considered beneficial or harmless to man'. Like the Lacey Act, it provided a tool to limit the extensive ornamental feather trade and the unregulated shooting of birds. Both the US and Great Britain (acting on behalf of Canada, which was part of the British Empire) realized that international treaties were necessary to protect animals with no international boundaries. The two countries agreed to stop all hunting of insectivorous birds and to establish specific hunting seasons for game birds.

The Migratory Bird Act agreement was implemented two years later with the passage of the Migratory Bird Treaty Act of 1918. The act established penalties for people who broke the law, making it a crime to pursue, hunt, take, capture, kill, or sell a migratory bird or any of its parts, including nests, eggs, and feathers. This effectively shut down the ornamental feather trade and gave species like the snowy egret a change to rebound.

Breeding plumage: Far better on the snowy egret!
By Len Blumin from Mill Valley, California, United States (Snowy Egret display) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
While bald eagles were covered under the Migratory Bird Treaty Act, they hadn't been directly affected by plume hunting. But sport shooting, bounty hunting, and habitat loss were another matter. The Bald Eagle Protection Act was enacted by Congress in 1940 to protect the bald eagle from direct hunting and habitat encroachment. As the territory of Alaska demonstrates, we haven't always admired bald eagles. Between 1917 and 1952, 128,273 bald eagles were killed and submitted to the Alaska Territorial Treasurer for bounty. We have no figures for the amount that were simply killed offhand or to provide feathers and parts for the trade in "authentic" Native American artifacts, but Congress felt that an act was needed to protect the bald eagle from extinction. The Golden eagle was added in 1962, amending the law to the Bald and Golden Eagle Protection Act.

While there are many complicated issues around the Migratory Bird Treaty Act (consider the controversial proposed bald and golden eagle take proposed by the Fish and Wildlife Service) it has saved millions if not billions of birds since the initial treaty was signed in 1916. Let's celebrate the act and keep moving forward to save birds for the next 100 years! Migratory birds need our help: as Steve Holmer, Senior Policy Advisor for the American Bird Conservancy, pointed out: "Forty percent of all migratory bird species are in decline, so it is urgent that we put in place practices we already know will save birds from needless deaths.”

Links
The Fish and Wildlife Service has a long list of important conservation messages. I chose my favorite ones to post here! Remember, times change, and threats change with them.

What is the main threat to migratory birds? 
  • Habitat loss due to urban development, agriculture and other human activities is the main threat to migrating birds. [Note: 'other human activities' is probably referring to global climate change].
  • Migratory birds depend on suitable breeding and wintering grounds and stopover sites where they can rest and feed along their migratory routes. The loss of any sites used by the birds during their annual life cycle could have a dramatic impact on their chances of survival.
What can we do about it? 
  • Conserve habitat - conservation works! Where we have invested in healthy habitats, birds are doing well. Healthy birds mean healthy forests, wetlands, grasslands, shorelines and oceans [and healthy forests, wetlands, grasslands, shorelines, and oceans mean healthy birds].
  • By conserving birds we conserve our American landscapes and the economies and ways of life that depend on them. From farmers and ranchers to outdoor recreationists to children, we all benefit when birds thrive.
#birdyear #thenext100years

Monday, May 23, 2016

Proposed 30-year take of bald and golden eagles

As a lot of eagle fans are aware, the Fish and Wildlife Service recently announced a plan that would allow companies to kill federally protected bald and golden eagles for up to 30 years. The draft rule will extend the current permit duration of five years to up to 30 years, giving wind farms, power lines and other large projects license to injure, disturb or kill a limited number of eagles in exchange for commitments to avoid and mitigate harm.

The proposed rule has positives and negatives. Before we discuss them further, the public is able to comment on the rule until July 5th, 2016, although comments on the information collection aspects of this rule must be received on or before June 6, 2016. You can comment by going here: https://federalregister.gov/a/2016-10542 and pressing the green 'submit a comment' button on the top right of the page. We encourage people to read through some of the public comments prior to submitting their own.  The Fish and Wildlife Service also has comments and responses available on its website.
Please read the rest of this blog for more information prior to commenting. 

History
The US Fish and Wildlife Service initially introduced a 30-year take rule in 2009. After reviewing the proposal, the American Bird Conservancy took the US Department of the Interior to court in 2014, stating that the Department of the Interior violated federal laws when it created a regulation allowing wind energy and other companies to obtain 30-year permits to kill protected Bald and Golden Eagles without prosecution by the federal government. The court agreed and the rule was invalidated in 2015. The Fish and Wildlife Service introduced a new rule in 2016, although it did not remove the 30-year take.

The current permitting program is voluntary: that is, companies can choose whether or not to join. The Fish and Wildlife Service hopes to bring a greater number of utility companies into the permitting program by changing the mix of penalties and incentives. Although the plan is not without negatives, more participation will yield more data about best practices for wind power and help determine how many birds and bats are killed by turbines.

Negatives
  • The plan seems heavily predicated on mitigation, and there are only a few mitigation methods for wind energy that have been verified to reduce bird kills.
  • Post-construction eagle mortality data is collected by paid consultants to industry instead of third-party experts, which is a conflict of interest.
  • 30 years is a very long time to allow take of bald and golden eagles. Technology and bird populations can change much more rapidly than the proposed take period. 
  • Permits remain voluntary. Companies can chose not to participate at all, although they will suffer legal penalties under the Bald and Golden Eagle Act and the Migratory Bird Treaty Act if they are found to have killed eagles. 
Positives
  • The proposed regulations require applicants for permits with durations of longer than 5 years to conduct a minimum of 2 years of pre-application surveys. Surveys are currently voluntary. 
  • Participation is voluntary and many companies currently opt out. Companies that join the permitting program will be under additional government scrutiny and are required to submit to a five-year review by the FWS, even though the 30-year take permit still stands overall. Companies found to be exceeding their take limits will be subject to additional penalties.
  • The new rule allows for more flexibility in responding to local conditions and adopting new technologies. 
A permitted bald eagle take is problematic to most of us and, as the American Bird Conservancy stated,  "...‘green energy' isn't green if it is killing thousands of eagles and tens of thousands of other birds annually." [link to statement]. However, no form of energy is free of cost to wildlife and wildlands. Coal mining is environmentally destructive in many ways, nuclear energy has a waste disposal problem, birds and bats hit turbines, and electricity produced by all three is transmitted over hundreds of thousands of miles of electrical lines that come with their own collision and electrocution risks. At this time, the Raptor Resource Project supports properly sited wind power as a renewable energy source that helps reduce the threats posed to birds and people by climate change. But we also believe that wind farms can and should be properly sited and operated in ways that minimize harm to federally-protected species.  We will be following the American Bird Conservancy very closely on this issue and encourage those of you who are concerned about the issue to submit comments. Please remember to write clearly and constructively if you do. I have participated in public comment meetings, and incoherent or inaccurate comments are not taken seriously by rule makers.

I was just emailed this link yesterday: http://www.postbulletin.com/news/local/eagle-nest-puts-brakes-on-xcel-energy-wind-turbines/article_d9026393-996a-53f0-9b1b-3e4cef7310c5.html. The article is about an Xcel Energy wind project. Xcel Energy was the first company to sign a Memorandum of Understanding (MOU) with the Fish and Wildlife Service, which Bob was always very proud of. It shows the benefits that participating in these kinds of programs can yield, as well as the challenges of accommodating a bald eagle population with some very different behaviors and territories than those of America's historic bald eagles.

Resources

Wednesday, September 04, 2013

Golden Eagles

Eaglecrest's nesting golden eagles normally appear only at a distance. But on August 31, an immature eagle decided to show up in camera range. Viewers were treated to amazing views of the eagle's golden feathers, large talons, nictitating eyelids, and overall plumage. Video highlights can be found here:


Golden eagles get their name from the golden or tawny wash of feathers on their head and neck feathers. Adult American gold eagles are otherwise dark (or chocolate) brown in plumage, with 'marbled' flight feathers on their wing and tail. They range from 26 to 40 inches in length. Overall size is a complicated issue - while American gold eagles tend to be smaller than their counterparts in Eurasia, the largest gold eagle ever recorded was a female banded and released in Wyoming in 2006. Although bald eagles are a little bit longer on average than golden eagles (34 inches in length versus 33 inches in length), the difference is small enough that some golden eagles will be longer than some bald eagles. Confusing the issue even further, golden eagles (unlike bald eagles) don't appear to follow Bergmann's rule: one study found that golden eagles in Idaho were larger than those from Alaska. We can confidently say that they have a larger wingspan than bald eagles: North American golden eagle wingspans range from 6 feet to 7.2 feet according to Animal Diversity Web.

The eagle's nictitating membrane protects its eye
Look at that face! The nictitating membrane found in all birds is clearly visible. This membrane protects and moistens a bird's eye while allowing it to see. It also helps protect the young eagle's eye from scratches administered by struggling prey animals. The golden eagle lacks the baffles or 'jet cones' in a peregrine's nose, probably because golden eagles don't dive as fast as falcons do. Golden eagles achieve speeds of 28-32 miles per hour in an unhurried soaring flight, although they can achieve 120 miles per hour in a fast glide, and 150 miles per hour in a stoop. Its curved beak has sharp cutting edges for tearing meat, but lacks a falcon's tomial tooth. The tomial tooth, a small projection on the outer edge of the upper mandible, allows falcons to bite through cervical vertebrae and sever the spinal column of prey, quickly dispatching it. Golden eagles, however, deal death with their talons.

Check those legs and talons out! Unlike bald eagles, adult golden eagles are 'booted' - that is, their feathers cover their entire legs down to the toes. This may help protect their legs from bites and scratches inflicted by struggling prey. Golden eagles eat more kinds of prey than I can list here, since over 400 vertebrate species have been recorded as golden eagle prey. Although golden eagles appear to have food preferences, they are highly opportunistic hunters that will predate most reasonably-sized animals. They aren't going to wait for rabbits if ground squirrels are available!

Talons. 'He clasps the crag with crooked hands...'
The long, powerful talons of the golden eagle make escape extremely unlikely once prey is contacted. They can be up to three inches long and exert approximately 440 pounds per square inch of pressure. Small prey might be crushed, while larger prey might die from blood loss, shock, or collapse of the lungs following multiple punctures. Although the argument about how much weight golden eagles can carry rages on (Teenagers! Whole cows! Adult wolves!), the general consensus among people who study golden eagles is that prey much over 4.5 pounds would need highly favorable wind conditions for lift. So if a large golden eagle had plenty of momentum, and if the wind was right, and if it was able to swoop down and catch prey in its talons without stalling out, it might be able to lift more. But how much more is a matter of debate. Very large prey is simply eaten in place.

With their short, wide tails and long, broad wings, golden eagles are built to soar. They cock their wings in a slight 'V', somewhat like turkey vultures, and hold their wing tips wide open, flapping only when necessary. Unsurprisingly, they prefer open country and like to nest up high. Jumping off something high to attain lift is much less work than dead-lifting from the ground and height may, in some cases, make it easier to get prey to the nest. At Eaglecrest, the resident golden eagles nest in a large tree. Their large stick nest (smaller than a bald eagle's nest, on average, but still pretty large) is lined with grass and other soft vegetation when in use.

The flash of white indicates an immature eagle
Golden eagles are territorial. Given that this was a juvenile (its feet were not fully booted, it reveals a flash of white at the base of its tail when flying, and it has a lot of white patches), it was most likely a 2013 fledgling that hadn't yet dispersed. Like bald eagles, golden eagles appear to disperse from the natal sites, wander (fairly) widely, and return to their natal region, if not nest, as they approach maturity. I hope our young golden eagle will survive to adulthood and return to contribute yet more magnificent golden eagles to the area. What a wonderful sight to see!

Things that helped me write about this topic: