A Conversation with National Audubon Society

Join the National Audubon Society for a conversation with bird-glass collision researcher and leading expert, Dr. Daniel Klem, Acopian Professor of Ornithology and Conservation Biology at Muhlenberg College in Pennsylvania.

His new book, 'Solid Air | Invisible Killer: Saving Billions of Birds from Windows', highlights decades of his research and summarizes both challenges and solutions.


Engineering Bird-Friendly Glass on PBS (scitech)now

Every year hundreds of millions of birds die from accidentally flying into glass buildings and windows. But now, new types of glass may make this easily preventable. Daniel Klem, Professor of Ornithology and Conservation Biology at Muhlenberg College in Pennsylvania joins Hari Sreenivasan to discuss creating bird-friendly glass.


The Cornell Lab of Ornithology: Why Birds Hit Windows—And How You Can Help Prevent It

Between 365 and 988 million birds die from crashing into windows in the United States each year, according to a new report. That may be as much as 10 percent of the estimated total bird population of the country.


Bird–Window Collisions: A Critical Animal Welfare and Conservation Issue, Journal of Applied Animal Welfare Science, 2015

Sheet glass and plastic in the form of clear and reflective windows are universally lethal to birds. Reasonable interpretation of available scientific evidence describes windows as a principal human-associated avian mortality factor that is an indiscriminate killer of common species as well as species of conservation concern. A conservative toll estimates 1 billion or more annual fatalities in the United States alone.


Science News: Stop blaming cats: As many as 988 million birds die annually in window collisions

Between 365 and 988 million birds die from crashing into windows in the United States each year, according to a new report. That may be as much as 10 percent of the estimated total bird population of the country.


Evaluating the Effectiveness of Select Visual Signals to Prevent Bird-window Collisions, The Wilson Journal of Ornithology, 2013

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Direct human-caused mortality of birds: improving quantification of magnitude and assessment of population impact. Scott R Loss, Tom Will, and Peter P Marra Front Ecol Environ 2012; doi:10.1890/110251, 2012

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Factors influencing the annual risk of bird–window collisions at residential structures in Alberta, Canada. Wildlife Research 39, 583–592. Erin M. Bayne Corey A. Scobie and Michael Rawson-Clark, 2012

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Scavenging affects persistence of avian carcasses resulting from window collisions in an urban landscape. Journal of Field Ornithology 83 (2):203-211. Stephen B. Hagar, Bradley J. Cosentino, and Kelly J. McKay, 2010

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Klem, D., Jr. Conservation issues: Sheet glass as a principal human-associated avian mortality factor, Chapter 20. In S. K. Majumdar, T. L. Master, R. M. Ross, R. Mulvihill, M. Brittingham, and J. Huffman [eds.], Avian ecology and conservation: A Pennsylvania focus with national implications. Pennsylvania Academy of Science, Easton, PA, 2010

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Avian Mortality at Windows: The Second Largest Human Source of Bird Mortality on Earth. Proceedings of the Fourth International Partners in Flight Conference: Tundra to Tropics. Pgs 244-251, 2010

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Rossler, M., Laube, W., Weihs, P. Avoiding Bird Collisions with Glass Surfaces. Experimental investigations of the efficacy of markings on glass under natural light conditions in Flight Tunnel II, 2009

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Preventing Bird–Window Collisions. The Wilson Journal of Ornithology 121(2):314-321. Daniel Klem Jr., 2009

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Windows and Vegetation: Primary Factors in Manhattan Bird Collisions. Northeastern Naturalist 16(3):455-470. Yigal Gelb and Nicole Delacretaz, 2009

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Architectural and Landscape Risk Factors Associated with Bird–glass Collisions in an Urban Environment, 2008

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Bird Density and Mortality at Windows. The Wilson Journal of Ornithology 120(3): 550-564. Stephen B. Hagar, Heidi Trudell, Kelly J. McKay, Stephanie M. Crandall, and Lance Mayer, 2008

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Windows: an unintended fatal hazard for birds. In Connecticut State of the Birds 2007. Connecticut Audubon Society, Fairfield, CT, pp. 7-12. Daniel Klem, Jr., 2007

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Glass: a deadly conservation issue for birds. Bird Observer 34(2): 73-81. Daniel Klem, Jr., 2006

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Comparison of fatal bird injuries from collisions with towers and windows. Journal of Field Ornithology 76(2): 127-133. Carl J. Veltri and Daniel Klem, Jr., 2005

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Effects of Window Angling feeder Placement, and Scavengers on Avian Mortality at Plate Glass. Wilson Bulletin, 116(1), pp 69-73. Daniel Klem, Jr., David C. Keck, Karl L. Marty, Amy J. Miller Bell, Elizabeth E. Niciu, and Cory T. Platt, 2004

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


The Washington Post, For Migratory Birds, a Building Concern

Between 365 and 988 million birds die from crashing into windows in the United States each year, according to a new report. That may be as much as 10 percent of the estimated total bird population of the country.


Collisions between Birds and Windows: A preliminary Review in France. Ornithos 7(76-80) Marc Duquet, 2000

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Glass and bird kills: an overview and suggested planning and design methods of preventing a fatal hazard. Wildlife Conservation in MetropolitanEnvironments, National Symposium on Urban Wildlife, Series 2, L. W. Adams and D. L. Leedy, eds, National Symposium on Urban Wildlife, pp. 99-103. Daniel Klem Jr., 1991

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Collisions between birds and windows: mortality and prevention. Journal of Field Ornithology 61(1): 120-128. Daniel Klem, Jr., 1990

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Bird-window collisions. The Wilson Bulletin 101(4): 606-620. Daniel Klem, Jr., 1989

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Avian predators hunting birds near windows. Proceedings of the Pennsylvania Academy of Science 55: 90-92. Daniel Klem, Jr., 1981

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Human Related Mortality of Birds in the United States. U.S. Department of the Interior, Fish and Wildlife Service, Special Scientific Report- Wildlife No. 25. Richard C. Banks, 1979

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.


Reflective Plate Glass- A Hazard to Migrating Birds. BioScience Vol. 26 No. 6. Richard C. Banks, 1976

When you are alone for days or weeks at a time, you eventually become drawn to people. Talking to randos is the norm. I’ll never forget the conversation with the aquarium fisherman, forest ranger, and women at the Thai market. It’s refreshing to compare notes on life with people from vastly different backgrounds.