Western flycatcher

The western flycatcher has been split into two species, which are hard to distinguish, and to tell apart from other Empidonax flycatchers.

DNA testing in 2014 confirmed a new field mark, involving the extent of buffy edging on the secondaries, to reliably distinguish these species from the yellow-bellied flycatchers.[1][2]

Birds known as western flycatcher include the Pacific-slope flycatcher (Empidonax difficilis) and the Cordilleran flycatcher (Empidonax occidentalis).

References

Engel, Joshua (26 November 2014). "A first for Illinois, discovered in The Field Museum's collection". Field Museum of Natural History. Retrieved 19 February 2022.
Engel, Joshua (2 December 2014). "Follow up: A first for Illinois, discovered in the Field Museum's collection". Field Museum of Natural History. Retrieved 19 February 2022.

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[1] Engel, Joshua (26 November 2014). "A first for Illinois, discovered in The Field Museum's collection". Field Museum of Natural History. Retrieved 19 February 2022.

[2] Engel, Joshua (2 December 2014). "Follow up: A first for Illinois, discovered in the Field Museum's collection". Field Museum of Natural History. Retrieved 19 February 2022.