Traill's flycatcher

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File:Empidonax traillii.jpg]]

Traill's flycatcher was a supposed species of tyrant flycatcher in the genus Empidonax, called Empidonax traillii. It was named by John James Audubon after his good British friend Thomas Stewart Traill.{{cite web |url=http://www.aboutorkney.com/ttraill00.html |title=About Orkney - Thomas Stewart Traill |website=www.aboutorkney.com |url-status=dead |archive-url=https://web.archive.org/web/20160912144910/http://www.aboutorkney.com/ttraill00.html |archive-date=2016-09-12}}

It is now considered to be two distinct but closely related species, which are outwardly very similar but prefer differing habitats and replace each other geographically without significant hybridization:

• Alder flycatcher, Empidonax alnorum
• Willow flycatcher, Empidonax traillii proper