Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys in San Diego County, California, 2020

Data presented are results of surveys in 2020 for Southwestern Willow Flycatcher (Empidonax traillii extimus) in San Diego County, California. Surveys were conducted...本数据集呈现的是2020年于加利福尼亚州圣迭戈县针对西南柳霸鹟（Southwestern Willow Flycatcher，学名Empidonax traillii extimus）开展的调查结果。本次调查工作已于……开展。