id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
inhs-384	Forbes, Stephen	The Midsummer Bird Life of Illinois: A Statistical Study	1913	16	.pdf	application/pdf	4142	158	65	The acreage in these crops was such that 15 per cent, of all the birds of the season were found in corn fields and 22 per cent, were in small *That is, taking an average density of the bird population for the whole area of the state as r, the density in pastures and meadows only is 1.39. 380 CROP AREAS AND BIRDS 381 of the more pronounced results for one species of bird throughout its range in summer, and for one kind of crop area as visited or inhabited by midsummer birds. It is a period of breeding and steady habitation for our most permanent and characteristic bird population, and will best help us to an understanding of the main normal ecological significance of Illinois birds.	cache/inhs-384.pdf	txt/inhs-384.txt