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Presents a study which examines the characteristics of the brown-headed cowbirds in the forests of Wisconsin. What the incidence of parasitism by brown-headed cowbirds have reported to show; Information on the Acadian flycatchers; Appearance of the cowbird populations.

Comments on the study regarding the breeding ecology of Cooper's hawks in urban and exurban areas of Tucson, Arizona. Analysis on the comparative nestling-fledgling mortality in the urban Tucson Study area (TSA); Calculation of the nest success rates at the time the broods were counted and banded; Mortality induced by trichomoniasis among urban fledglings in Tucson; Information which the authors of the study failed to provide.