Jim Williams has been watching birds and writing about their antics since before "Gilligan's Island" went into reruns. Join him for his unique insights, his everyday adventures and an open conversation about the birds in your back yard and beyond.

Posts about Bird conservation

We all have our problems

Posted by: Jim Williams Updated: October 13, 2014 - 3:41 PM

It's not about glass. It's about the roasting pan.

Ortolans are birds in the bunting family, found in northern Europe. In France they are regarded as a culinary delicacy, consumed head, bones, all in one mouthful. Hunting Ortolans, however has been illegal since 1999. Now, French chefs are asking for one weekend a year when they can legally serve Ortolans. Birders are protesting. Ortolans are trapped by poachers as the birds migrate from Europe to Africa. The birds,weighing less than an ounce, are prized for their fat. Captured, they are kept in darkness for three weeks, and sometimes blinded, according to a story in today’s “New York Times.” The birds are fattened on millet and grapes. When the bird has tripled its fat, it is “drowned with Armagnac, plucked, roasted, and served hot in its entirety.”

The decision on one legal weekend is pending.

Construction details

Posted by: Jim Williams Updated: October 6, 2014 - 11:28 AM

I’ve been in touch by email with an architect in New York City, partner in a large firm there, who has an interest in the Vikings stadium under construction because she believes strongly in bird-safe buildings. She gave me links to web pages that contained information new to me, which doesn't mean it's new.


One of the links was to the Minneapolis daily business newspaper “Finance and Commerce.” In late April it carried an excellent article by Frank Jossi that answers a couple of my questions. I also received information from the Minnesota Sports Facilities Authority.


I learned that 60 percent of the stadium roof will be made of a partly transparent building material known at ETFE (ethylene tetrafluoroethylene, a fluorine-based polymer). It comes in very thin sheets that will be used to form what you might call pillows, inflated by air pressure (but not subject to the puncture failure and collapse we saw at the old stadium). 


Jossi explained that the stadium will have glass 20-feet-wide at the top of its exterior walls, just beneath the ETFE roof. And there is the 200-foot-wide wall of glass on the stadium’s west side that is causing concern among birders. Maybe the 20-foot surround is regarded as a problem, too; I’ve not heard it mentioned in particular. But it is glass, and it does reflect. 


The figure commonly used for the amount of glass on the stadium’s exterior is 200,000 square feet. Actually, and this is the question the authority did answer, the amount is 180,000, not that that makes much difference.


There will be some pattern to the ETFE roofing material. It lets sunlight pass; that could cause a serious heat problem, a greenhouse effect. The material will contain two dot-matrix patterns, Jossi wrote, to block some sunlight and heat. Birders wish such patterns would be incorporated in the glass, to lessen reflection.



NYC architect comments on stadiums, glass, and birds

Posted by: Jim Williams Updated: October 1, 2014 - 5:09 PM

By Deborah LaurelPrendergast Laurel Architects 

New York City, 16 September 2014

As we approach the centennial of The Migratory Bird Treaty Act of 1918, enacted to make it unlawful to kill America’s native birds, threats to the future of many species are on the rise. Various communities across the U.S. have reached the conclusion that the time to employ bird-friendly building design has arrived. Meanwhile, new building construction is expanding with the population, and glass buildings have become ubiquitous. A Pilkington industry report notes that 6 million tons of glass was installed in North America in 2008 alone. Birds are facing a rapidly rising wave of hazard.

As an architect, I encountered the collision problem at completion of one of our projects when the director complained that birds were crashing into the windows. I began to work with Audubon, The American Bird Conservancy, architects, and scientists to identify alternative approaches to glass that can lower the risk of a fatal collision. Interestingly, our testing has shown that visible marks on glass, covering as little as 5% of the surface, can reduce collisions by up to 95%. In addition to marking glass with a permanent pattern, such as ceramic frit, lowering glass reflectivity is equally important. Just as there are many recipes for bread, there are many recipes for requisite energy coatings on glass. Among common architectural glass products, coating reflectivity ranges from 5% to a high of 40%. In simple terms, this highly reflective glass is coated with a mist of “silvered” metal oxides resulting in 60% transparency. As an example, Minnesota Audubon’s data on the specified glass for the upcoming Minnesota Viking’s stadium indicates 30% reflectivity, an alarmingly high rating. Add to this plans to include a new park adjacent to the mirrored windows of the stadium, and the results are predictable.

As a volunteer for New York City Audubon’s Project Safe Flight I saw firsthand the destructiveness of glass installed at buildings in Manhattan. I collected migratory bird species, such as the sunflower yellow Magnolia Warbler, and other birds that had all perished by flying toward the reflection of adjacent parks in the windows of the buildings I was assigned to monitor. Project Safe Flight offers instructive data for a building similar to the stadium, the Jacob Javits Convention Center. It is a large glass curtainwall exhibit hall that opened in 1986. The reflectivity of the original glass was 35%. In three months of Project Safe Flight monitoring during the fall of 2007, 75 collision fatalities were collected. Recently, the building skin was replaced with a mix of clear and dot frit glass with a low 8% reflectivity. Fall 2013 post-construction monitoring totaled only four fatalities, a 95% reduction!

The proposed stadium for the Minnesota Vikings, designed with 200,000 square feet of monumental glass walls, is an example of the grave threat posed by a reflective glass building. It is a fatal avian collision trap. Although Minnesota Audubon has approached the Minnesota Sports Facilities Authority with information on safer glass options, the Vikings have declined to revisit the stadium design.

Viracon, a Minnesota based company, supplied the glass for Javits, and they also will provide glass for the new Vikings stadium. Our inquiries with Viracon have revealed that glass similar to the stadium selection, but with much lower reflectivity, is available at negligible increase in cost. The addition of ceramic frit may add up to 20% to the glass material cost, but this is a tiny fraction of the myriad trade costs required to build a stadium. And frit adds long term benefits including energy-saving solar shading, as well as control of glare, that is desirable in a stadium. Just as there are many types of glass, there is a wide range of pricing.

Perhaps a bird-friendly selection can be identified for less than the $1.1 million cost cited. Structural steel erection has just begun at the stadium, so it may be 9-12 months before the windows are released for fabrication. That’s enough time to change course. The Minneapolis City Council has passed a resolution asking the Vikings to add frit to the glass. The State of Minnesota has a $498 million stake in the stadium, as part of a joint venture with the Vikings. Surely a prominent State appointed institution such as the Minnesota Sports Facilities Authority can find a way to join Audubon and initiate a change of the specified stadium glass.

Across the nation, changing our approach to glass is critical to the future of America’s native birds, such as the Ruby-throated Hummingbird, a species that is on the top ten list of window collision casualties collected in Minnesota.

Glass is what we make it. It’s time to make it safer.

(Used with permission of the author.)





200 attend protest rally

Posted by: Jim Williams Updated: September 27, 2014 - 6:51 PM

The refusal by the Minnesota Sports Facility Authority and the Minnesota Vikings to use bird-safe glass in the stadium now under construction drew an estimated 200 persons to a protest rally Saturday afternoon. Birders gathered across the street from the stadium site to hear speakers, and wave banners and signs. They want the stadium's huge signature "window" which will cover the end of the stadium facing downtown to be made of glass which does not reflect what is in front of it. Those reflections visually continue the natural world as birds see it, causing them to attempt to fly through. Most birds colliding with windows die. Below, author Laura Erickson from Duluth speaks to the crowd, which gathered in front of the construction site.

The complete Audubon report on climate change

Posted by: Jim Williams Updated: September 10, 2014 - 8:21 PM

Here is a link to the complete National Audubon report on climate change and North American birds.


If nothing else, scroll to the end to see the photo of a young Common Loon on the mud in the recently drained pond where it was hatched. 


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