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Full-Text Articles in Social and Behavioral Sciences
Fatal Pox Infection In A Rough-Legged Hawk, G. L. Pearson, D. A. Pass, E. C. Beggs
Fatal Pox Infection In A Rough-Legged Hawk, G. L. Pearson, D. A. Pass, E. C. Beggs
USGS Northern Prairie Wildlife Research Center
Natural pox infection occurred in a free-living rough-legged hawk (Buteo lagopus) in northeastern North Dakota. Gross, histological and electron microscopic findings were typical of pox infection, and characteristic lesions developed in red-tailed hawks (Buteo jamaicensis) but not in great horned owls (Bubo virginianus) following inoculation with case material. Death of the rough-legged hawk was attributed to starvation resulting from inability to capture prey and to blood loss from foot lesions.
Age Determination Of Female Redhead Ducks, Charles W. Dane, Douglas H. Johnson
Age Determination Of Female Redhead Ducks, Charles W. Dane, Douglas H. Johnson
USGS Northern Prairie Wildlife Research Center
Eighty-seven fall-collected wings from female redhead ducks (Aythya americana) were as- signed to the adult or juvenile group based on "tertial" and "tertial covert" shape and wear. To obtain spring age-related characters from these fall-collected groupings, we considered parameters of flight feathers retained until after the first breeding season. Parameters measured included: markings on and width of greater secondary coverts, and length, weight, and diameter of primary feathers. The best age categorization was obtained with discriminant analysis based on a combination of the most accurately measured parameters. This analysis, applied to 81 wings with complete measurements, resulted in …