Wednesday, September 26, 2007

Bird strikes - four-story glass walkway

The study is Bird Mortality at a Glassed-In Walkway in Washington State, by R.E. Johnson and G. E. Hudson. It was published in 1976 in Western Birds, 7:99-107.

The most common bird in the study between May 1968 to March 1970 (28 birds out of 155) was the pine siskin,, a small finch with a brown-streaked body. American Robin (turdus migratorius - and yellow warbler (Dendroica petechia - were next most common, with 9 each out of 155 specimens.

Migration seasons, especially fall, were most lethal for birds. The location in this study was a glass walkway that does not reflect but seems completely transparent. An invisible barrier.

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