Southwestern Willow Flycatcher (Empidonax traillii extimus) Surveys at the City of Carlsbad Preserve, San Diego County, California—2025 Data Summary

Type: report

Authors: Allen, Lisa; Kus, Barbara;

Year: 2026

Prepared by: U.S. Geological Survey, Western Ecological Research Center;

Keywords: data summary;

Species: Southwestern willow flycatcher

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