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Study of the migration stopovers, breeding behavior, and survival rates of the endangered whooping cranes (Grus americana) between fall 1981-83 and spring 1983-84. Distribution pattern of radio-tracked birds observed to be greatly different from distributions derived from opportunistic sightings. observations carried out between Aransas National Wildlife Refuge, Texas, and central Saskatchewan.
Bald eagles (Haliaeetus leucocephalus) associate with wintering waterfowl concentrations throughout the United States, but little detailed information is available on eagle-waterfowl relations. This report concerns the ecology of bald eagles wintering in the vicinity of Swan Lake National Wildlife Referenc in north-central Missouri and, more specifically, examines the association of the eagles with waterfowl during the winters of 1975-76, 1976-77, and 1977-78