Nesting Raptors in Western Wyoming, 1947 and 1975
Craighead FC and Mindell DP. 1981. Nesting Raptors in Western Wyoming, 1947 and 1975. The Journal of Wildlife Management. 45(4):865-872
Numbers of nesting raptors on a 31.1 km2 area in western Wyoming declined 30% between 1947 and 1975. The common raven (Corvus corax) population increased from 3 to 11 pairs, and Swainson's hawk (Buteo swainsoni) and red-tailed hawk (B. jamaicensis) combined decreased from 17 to 9 pairs. Data from 1948, 1978, and 1979 support these changes. Nesting success was 50% less in 1975 than in 1947, and nesting dates for most species were later in 1975. Increases in human disturbance and changes in the natural environment are described and indicated as factors effecting the raptor population decline.
- Type
- Journal Article
- Authors
- Craighead, Frank; Mindell, David
- Units
- GRTE
- Keywords
- Animal Studies, Animals, Birds, Common Raven (Corvus corax), Nests & Nesting, Population Dynamics, Raptors, Red-Tailed Hawk (Buteo jamaicensis), Swainson's hawk (Buteo swainsoni)