Daniel Klem

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Daniel Klem Jr.
Daniel Klem.jpg
Klem in 2004
NationalityUnited States
EmployerMuhlenberg College

Daniel Klem Jr. is a United States ornithologist, known for his pioneering research into the mortality of birds due to glass windows.[1][2][3] He is Sarkis Acopian Professor of Ornithology and Conservation Biology at Muhlenberg College.[3]

Klem obtained his BSc at Wilkes University and his MSc at Hofstra University.[3] He served in the US military served during the Vietnam War, and was awarded the Bronze Star Medal.[3] He subsequently obtained his doctorate from Southern Illinois University.[3]

In his 1990 papers "Bird injuries, cause of death, and recuperation from collisions with windows" and "Collisions between birds and windows: mortality and prevention", he calculated that between 100 million and 1 billion birds are killed, annually, in the United States alone, by flying into windows.[1]

His research has influenced the design of buildings, not least the Niagara Falls State Park Observation Tower, on which he was a design consultant.[1][3] He holds several US patents relating to windows design.[4] He has also written about the birds of Armenia.

He received an honorary doctorate from Wilkes, where he is also a trustee.[3]


  • Adamian, Martin S.; Klem, Daniel (1997). A Field Guide to Birds of Armenia. American University of Armenia Corporation. ISBN 978-0965742924.
  • Adamian, Martin S.; Klem, Daniel (1999). Handbook of the Birds of Armenia. American University of Armenia Corporation. ISBN 978-0965742931.



  1. ^ a b c Warner, Gene (December 12, 2016). "Professor finally recognized for his bird-saving efforts at Niagara Falls". The Buffalo News. Retrieved May 9, 2017.
  2. ^ Erickson, Laura (May 7, 2017). "Standing on the Shoulders of a Giant". Retrieved May 9, 2017.
  3. ^ a b c d e f g Weidner, Krista (April 13, 2017). "Bird Watcher". Wilkes Magazine. Retrieved 9 May 2017.
  4. ^ "Daniel Klem, Jr. Inventions, Patents and Patent Applications". Justia Patents Search. Retrieved May 9, 2017.

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