Abstract
ABSTRACT The central plains and the Platte River Valley of Nebraska are recognized as important winter habitat for many raptor species, but few studies have evaluated the ecology or physiology of birds of prey wintering in the region. The purpose of our study was to collect morphological data from Red-tailed Hawks (Buteo jamaicensis) occupying the study area during non-breeding months to better understand the sex ratios and potential changes in body condition of raptors in central Nebraska. Female Red-tailed Hawks were trapped significantly more often than males (χ2 = 11.560, df = 1, P < 0.01), and data suggest that the population consists of a larger number of adult females followed by juvenile females and adult males, respectively. No juvenile males were captured during the study. Stratifying the data by sex and age group indicate that adult female Red-tailed Hawks significantly increase body mass (F = 13.049, df = 1, 13, P = 0.004) over time, and normalization of data by animal size to form a...
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