INHS has over a century of data on bird populations in Illinois and beyond. The Ornithology of Illinois Volume 1 by Ridgway and Forbes was published in 1889.
Stephen A. Forbes and Alfred O. Gross began North America's first systematic bird survey in 1906. This survey was repeated by Richard and Jean Graber in 1950 and by a team of INHS ornithologists from 2006-2008. The results comparing the studies was published in 2011 as Illinois Birds - A Century of Change.
Examples of INHS Avian Ecological Research
Long-term monitoring of prothonotary warblers in southern Illinois
Foraging ecology of shorebirds in the Illinois River valley
Articles from INHS Reports