Distribution and abundance of winter Distribution and abundance of winter populations of bald eagles in Illinois distributionabun129have Year: 1988 February 1988 Havera and Kruse: Winter Populations of Bald Eagles IS I 15 29 12 DEC JAN Fig. numbci of bald eagles counted per invenloiv in ihe Upper Illinois River Region. 197( Seasonal patterns of hald eagle octiirrence in the Central Illinois Rivei Region are ilhistiated in Figure 20. No census tliglits were toiuhuied from mid-

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