Thursday, Feb. 9, at 7 p.m. in CNS C101

Dr. Jeff Walk, the director of science for the Illinois Chapter of The Nature Conservancy, will give a talk based on the book Illinois Birds: A Century of Change, published in 2010.

From 1906-1909, Stephen Forbes, Alfred Gross and Howard Ray conducted the first quantitative bird survey in North America, documenting the numbers of all species they observed in all habitats across Illinois with a specific, repeatable method. Richard and Jean Graber repeated the study from 1956-1958, and Walk and his colleagues replicated their efforts from 2006-2008.

Walk will summarize his findings in this talk, which is supported by the Beach Lewis fund of the IWU Biology Department.