Southwestern willow flycatcher

Empidonax traillii extimus

Habitat: Riparian; elevation below 8,500 feet

Survey Window: May 1–Jul 31

• May: 1 diurnal survey; June: 2 diurnal surveys; July: 2 diurnal surveys

• Five-day minimum interval between any survey

• When surveying for both southwestern willow flycatcher and least Bell’s vireo, separate surveys must occur with flycatcher surveys performed first