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- W2322438861 abstract "LARGE numbers of the Rough-legged Hawk (Buteo lagopus) winter in the agricultural areas of the northern one-third of Illinois. In the course of my investigation of the winter habits and behavior of this species in DeKalb County, Illinois, during the winters of 1964-65 and 1965-66, it became apparent that there were pronounced day-to-day differences in the relative numbers of Rough-legged Hawks flying and standing. It appeared that these differences might be related to fluctuations in local weather conditions. Therefore, I attempted to learn more about the activity patterns of the hawks in relation to major environmental variables. Rough-legged Hawks hunt for food either by soaring and hovering or by watching for prey from a perch. Although I have no direct evidence, it may be that more prey animals are captured per unit time by flying birds as compared to perching hawks. Thus, the presence or absence of favorable conditions for flight may be a determining factor in the relative number of Rough-legs flying in search of food at any one time. The study was conducted in a 43.1 square mile area located near the center of DeKalb County; the major part of this area is in Afton Township. The terrain varies from flat to gently rolling; no large areas of timber are present and more than 80 per cent of the land is in crops. Lone trees, small groups of trees, and other suitable perching sites are scattered throughout the study area." @default.
- W2322438861 created "2016-06-24" @default.
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- W2322438861 date "1967-04-01" @default.
- W2322438861 modified "2023-09-28" @default.
- W2322438861 title "Environmental Influence on the Incidence of Flight in the Rough-Legged Hawk" @default.
- W2322438861 doi "https://doi.org/10.2307/4083185" @default.
- W2322438861 hasPublicationYear "1967" @default.
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