Adults have greenish upperparts and yellowish underparts (especially on the throat), with a dusky wash on the chest. They have a white or yellow eye ring that lacks the teardrop projection of Pacific-slope (E. difficilis) or cordilleran (E. occidentalis) flycatchers, white or yellowish wing bars that contrast strongly against the black wings, a broad, flat bill, and a relatively short tail when compared to other members of the genus. The upper mandible of the bill is dark, while the lower mandible is orange-pink.
The yellow-bellied flycatcher's song can be transcribed as a rough, descending "TSE-berk," which can be similar to the more common least flycatcher's snappier, more evenly pitched "che-bek." To identify the difference between the two species by sound: yellow-bellied flycatchers make the sound TSE-berk at five second intervals, and the least flycatcher at one or two second intervals. The three primary call notes of yellow-bellied flycatcher are a clear, ascending "chu-wee," It soua sharp, gruff "peekk", and a soft, descending "pyu."
|Wikimedia Commons has media related to Yellow-bellied Flycatcher.|
|Wikispecies has information related to: Empidonax flaviventris|
- Yellow-bellied Flycatcher Species Account - Cornell Lab of Ornithology
- Yellow-bellied Flycatcher - Empidonax flaviventris - USGS Patuxent Bird Identification InfoCenter
- Yellow-bellied Flycatcher, Environment Canada
- Yellow-bellied Flycatcher Canadian range, Canadian Biodiversity Web Site
- "Yellow-bellied Flycatcher media". Internet Bird Collection.
- Yellow-bellied Flycatcher photo gallery at VIREO (Drexel University)
- Interactive range map of Empidonax flaviventris at IUCN Red List maps