The Behavior and Ecology of Fall Peregrine Falcons at Lummi Bay and Vicinity, Whatcom County, Washington
CORPS OF ENGINEERS SEATTLE WA SEATTLE DISTRICT
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The behavior and ecology of Peregrine-Falcons were studied at Lummi Bay, Whatcom County, Washington, from October through December, 1983. Peregrines were observed 207 times on 80 of the field days. We identified a minimum of 15 individual falcons during the study. The main peregrine activity was centered in and around Lummi Bay. Habitat preferred by the dominant adult female included a wooded ridge, tidal mudflats, and level agricultural fields. Combined observations yielded 154 hours and 46 minutes of direct study of peregrine behavior falcons were perched 84 of that time, in flight 16. Forty two prey items, primarily ducks and shorebirds, were recovered. Peregrines were successful hunters 22 of the time 153 hunting flights were witnessed. An adult female was radio-tagged on 1 December and followed over the next 30 days. She roosted in the San Juan Islands, 11 miles southwest of the main study area.