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Pioneered in the early 1980s by Carter Faust, the GGRO Hawkwatch has shown that up to nineteen raptor species pass through the Marin Headlands each fall. Four of these - Cooper's, Sharp-shinned, and Red-tailed Hawks and Turkey Vultures - account for 84% of the flight. Rarest are the Bald Eagle, Swainson's Hawk and Northern Goshawk, which in some years don't appear at all.
Using a unique Quadrant System to count hawks, the Hawkwatch is designed to detect daily and seasonal migration patterns, as well as to monitor changes in species numbers over the long-term.
Similar migration counts made at Hawk Mountain, Pennsylvania, since 1935 documented the decline of Osprey, Peregrines, and Bald Eagles during the DDT era. Using a counting system that stresses consistency, we believe that the GGRO Hawkwatch data can similarly reflect drastic population changes for birds of prey.If you want to learn more about being a GGRO volunteer,
visit our Volunteers link or contact the GGRO.
Contact the GGRO:
Mail:
Golden Gate Raptor Observatory
Building 201, Fort Mason
San Francisco, CA 94123
Phone:
(415) 331-0730
E-mail address:
ggro@parksconservancy.org
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