Tarof, Scott A., and James V. Briskie. 2008. “Least Flycatcher (Empidonax minimus).” The Birds of North America, edited by Paul G. Rodewald. Ithaca: Cornell Lab of Ornithology. Retrieved from the Birds of North America: https://birdsna.org/Species-Account/bna/species/leafly doi: 10.2173/bna.99