id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
inhs-175	Bellrose, Frank C.; Scott, Thomas G.; Hawkins, Arthur S.; Low, Jessop B.	Sex Ratios and Age Ratios in North American Ducks	1961	108	.pdf	application/pdf	42735	1903	66	An average annual mortality rate for adult drake mallards in the Mississippi Flvway of about 40 per cent has been derived from band recoverj'^ data for drake mallards banded as adults at Lake Chautauqua, Mason CountA% Illinois, 1939-1944 (Bellrose & Chase 1950:9). The hens of diving ducks engage in less renesting activity than do the hens of dabbling ducks, and some observers feel that diving duck drakes tend to be more persistent in remaining with nesting hens than do the drakes of dabbling ducks.	cache/inhs-175.pdf	txt/inhs-175.txt