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District biologist, initiated the project and was a constant source of encouragement and support. Sam Mattise, Cascade Resource Area biologist, served as supervisor and saw to it that all of our field and office needs were met. Both of them assisted in all phases of the project. We are also grateful to Roger Rosentreter for helping with plant identification, Bob Stucker for installing solar panels at our field camp and for helping develop an efficient grouse-trapping method, Terri Thomason for helping with the word processor, Laurie Guntly for preparing the figures, and Raul Morales for helping during the 1984 field season. Brian Czech, Skip Lisle, and Janet Berryhill were hard-working volunteer field assistants. Idaho Department of Fish and Game personnel provided a variety of assistance. Research biologist Bob Autenrieth was project leader for the first two years of the study, during which he supplied most of the field equipment, helped trap grouse, and gave freely of his time and expertise. Lou Nelson advised on computer use and statistical analyses, Fred Edwards and Andy Ogden provided historical information on sharptails in the Hog Creek study area, and Jack Connelly secured funding during the later stages of the study and reviewed the final report. Bob Eng, Montana State University, served as advisor of Vicki's graduate committee. In that capacity he reviewed the chapters on summer habitat use and the Hog Creek study area, and was a valuable consultant to the project. Lynn Irby, Jack Taylor, and Bob White, also of Montana Sate University, provided additional comments on Vicki's thesis. Terri Lonner, Montana Department of Fish, Wildlife, and Parks, provided computer programs for home range and use-availability analyses. Nancy Shaw, Intermountain Forest and Range Experiment Station, was a valuable source of information on the range literature. The dancing sharptail on the cover was drawn by Shelley Watters. Finally, and most importantly, this study would not have been possible without the cooperation of the Tarter, Nelson, and Dunham families, who generously granted us unlimited access to their lands. We especially thank George and Nellie Tarter for their friendship and assistance during the 3 years that we resided on their land.

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Bristle-thighed Curlews (Numenius tahitiensis) fly at least 4,000 km non-stop from staging grounds in western Alaska to the northern edge of the winter range at Laysan Island in the Northwestern Hawaiian Islands. Adults migrate from Laysan in early May and return in July and August. Juveniles, which arrive in late August and early September, largely migrate unaccompanied by adults. Compared with other shorebirds, Bristle-thighed Curlews migrate in small flocks and show no diurnal pattern in timing of departures. Subadults do not fatten adequately for migration but often accompany departing adults briefly and then return to the island. Fat content in adults at the start of spring migration is high, averaging 42%. Our findings indicate that curlews wintering in the Central and South Pacific overfly Hawaii during spring and autumn, undertaking non-stop flights of >6,000 km. In the absence of tailwinds, only two of the four flight range models that we tested (Summers and Waltner 1979, Davidson 1984) provide reasonable estimates of the migratory performance of Bristle-thighed Curlews (i.e.. non-stop flights from Alaska to Laysan and beyond). Within the range of altitudes at which they migrate, curlews probably seek out tailwinds that facilitate long-distance, non-stop flights.