This natural history focuses on the California population of Swainson’s hawks. Habitat The Swainson's Hawk has the longest migration of any North American raptor. The Swainson’s Hawk Mitigation Program, amended by the Board of Supervisors in December of 2009, provides the following voluntary means for mitigation of impacts to Swainson’s Hawk foraging habitat: Projects with impacts less than 40 acres; Fee Option. Swainson’s Hawks come in both dark and light morphs.
Swainson’s hawks nest across the western United States and Canada. Swainson’s hawks in California were listed by Summary of Swainson’s Hawk’s Natural History The Swainson’s hawk (Buteo swainsoni) is found throughout western North America and is a relatively common hawk in much of its range (Figure 1). We've been studying a population of Swainson's Hawks for 40 years. Migration and Habitat Preferences of Swainson's Hawks at an Autumn... Nesting Habitat and Productivity of Swainson's Hawks in Southeastern Arizona KNEMIDOKOPTES IN A SWAINSON'S HAWK, BUTEO SWAINSONI The Swainson's Hawk is a slender buteo, similar in length to the Red-tailed Hawk, but with a longer wingspan and weighing about 20% less. We plan to continue this project and learning about their ecology, movements and interactions with other species.
From North America through Mexico and Central America to wintering grounds in Argentina, the hawk’s annual migration ranges from 11,000 to 17,000 miles. Most Swainson’s Hawks are light morphs with white bellies, a dark or reddish-brown chest, and brown or gray upperparts. Their winter migration is a spectacular sight as they migrate overland in vast flocks (kettles) that fill the skies. The pointed wings are held in a strong dihedral in flight. There are three different color phases, light, dark, and intermediate (or rufous), all of which occur in Washington. Their round-trip flights from breeding grounds in North America to the South American pampas (grasslands) in southern Brazil or Argentina and back, can be as long as 14,000 miles (22,400 km). Compared to many other Buteos, Swainson’s Hawks are less hefty and slimmer with longer wings. While soaring, look for them holding their wings in shallow V shape. We are looking for help funding projects to track both adults and juvenile birds, including their migration …
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