Willow Flycatcher

Subspecies (4)

• Empidonax traillii adastus

  breeds Great Basin and central Rocky Mountains southward to Utah and Colorado; winters mainly western Mexico southward to Costa Rica

• Empidonax traillii brewsteri

  breeds Pacific Northwest (southern British Columbia) to mountains of central California; probably winters mainly western Mexico southward to Panama

• Empidonax traillii extimus

  breeds southern California eastward to New Mexico and (?) formerly western Texas

• Empidonax traillii traillii

  breeds Great Plains to northeastern USA and southeastern Canada; winters to northwestern South America