Geographical distribution of Willow flycatcher.    Breeding  Migration  Nonbreeding
Willow Flycatcher (Empidonax traillii), In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. retrieved from Neotropical Birds Online: https://neotropical.birds.cornell.edu/Species-Account/nb/species/wilfly
Cephas