Johnson, R.E. and G. E. Hudson, 1976. Bird Mortality at a glassed in Walkway in Washington State. elibrary.unm.edu/sora/wb/v07n03/p0099-p0107.pdf
Mortality was greatest during migration seasons, especially fall. The location in this study was a glass walkway that does not reflect but seems completely transparent. An invisible barrier.
Wednesday, September 26, 2007
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