Distribution, abundance, and breeding activities of Southwestern Willow Flycatchers (<i>Empidonax traillii extimus</i>) on the San Dieguito River and upper San Luis Rey River, San Diego County, California—2025 data summary
Barbara E. Kus
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2026-06-10
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via USGS Publications Warehouse
Executive Summary We surveyed for Southwestern Willow Flycatchers ( Empidonax traillii extimus ; flycat…
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