The Willow Flycatcher (Empidonax traillii) is a species of bird (Aves) in the family Tyrannidae (Tyrant Flycatchers) and order Passeriformes (Perching Birds).
Empidonax virescens
Empidonax alnorum
Empidonax atriceps
Empidonax fulvifrons
Empidonax oberholseri
Empidonax wrightii
Empidonax hammondii
Empidonax minimus
Empidonax affinis
Empidonax difficilis
Empidonax albigularis
Empidonax traillii
Empidonax flaviventris
Empidonax flavescens