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Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys at the city of Carlsbad Preserve, San Diego County, California—2025 data summary

March 19, 2026

Executive Summary 

We surveyed for Southwestern Willow Flycatchers (Empidonax traillii extimus; flycatcher) at five survey areas within the City of Carlsbad Preserve, Carlsbad, California, in 2025. Three flycatcher surveys were completed between May 16 and June 30, 2025. One transient flycatcher was observed at the Lake Calavera survey area in the City of Carlsbad Preserve in 2025.

Publication Year 2026
Title Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys at the city of Carlsbad Preserve, San Diego County, California—2025 data summary
DOI 10.3133/dr1223
Authors Lisa D. Allen, Barbara E. Kus
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Data Report
Series Number 1223
Index ID dr1223
Record Source USGS Publications Warehouse
USGS Organization Western Ecological Research Center
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