The Least Flycatcher is common in Canada and northern United States. It can be found in open woods, aspen groves, orchards, shade trees, villages, parks, rural roadsides, woodland borders. Appropriately named as it is the smallest and shortest billed flycatcher and spends the least amount if time on its nesting grounds for a flycatcher.
It has olive or grayish upperparts, whitish throat, grayish breast, with a pale yellow belly and under tail. Note the narrow but distinct eye ring and distinct wing bars. Grayer above and lighter below than other empidonax species.
Its song is a simple repeated "che-BEK" with a short "wit" call often repeated in a rapid series.