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Juvenile Least They are larger than a kinglet, of course, but equal or smaller than a junco, depending upon species. On breeding territories Least Flycatchers are aggressive to intruders, both their own and other species. This structure may be appreciated in Fig. Juveniles peak a month later (amazing, eh? Rosche (1982) observed one in Dawes Co 5-10 Jul 1973 (Williams 1973) and suspected as early as 1982 (Rosche 1982) that this might be a breeding species in the northwest, as did Ducey (1988). Diminutive and obscurely marked, the Least Flycatcher sits quietly in the leafy foliage of northern hardwood forests across the northern U.S. and southern Canada. "The species is most numerous below 2,500 feet, and rare and Local as high as 3,500 feet. Winter: Dickey and van Rossem (1938) say that the least flycatcher is "common in fall, winter, and spring throughout the Arid Lower Tropical Zone" in El Salvador, between September 3 and April 22. Unlike other Empidonax flycatchers, it is more likely to sing during migration and has been reported across Tennessee in the spring. Boxplots provide a quick visual of the distribution of the variable importance from the random forest models from all 147 species (black boxplot) and how each species fits into the overall distribution (cyan line). Predictor Importance for Least Flycatcher (Empidonax minimus) Relative to All Species. ), peaking from late August until the end of the first week of September (Hussell, 1981). A 13-cm-long bird with a relatively large head, gray (sometimes olive-tinged) dorsum (browner in juveniles), bold white eye ring, two white wing bars (buffy in juveniles), whitish throat, gray-washed breast, yellowish belly and undertail coverts (whitish in juveniles), and a short, flattened triangular bill (lower mandible mostly pale). Rowland (2009) describes the Least Flycatcher as a short-winged and long-tailed Empidonax. Least Flycatcher Moucherolle tchébec Empidonax minimus Information, images and range maps on over 1,000 birds of North America, including sub-species, vagrants, introduced birds and possibilities Once you have identified your mystery bird as some type of tyrant flycatcher--the world's most numerous family of birds with over 400 species--your work really begins! The Least Flycatcher is a small and widespread member of the group of hard to identify flycatchers in the genus Empidonax. Least Flycatcher ID Ratty-looking adult Least Flycatchers are on the move south as early as the third week of July, entirely petering out by late August. Studies have shown that Least Flycatchers typically spend about 64 days on the breeding grounds, and 58 days are needed to complete a nesting cycle. Compared to an Alder Flycatcher, the Least has a more conspicuous eye ring and a shorter primary projection (Alderfer & Dunn, 2014). A few key features separate this bird from the similar Alder Flycatcher. As with other members of this genus, it is best identified by song, a harsh two-noted che-bek.. The Least Flycatcher is a small, drab flycatcher that reaches near the southern limit of its breeding range in the highlands of northeastern Tennessee. Rosche (1994b) indicated that Least Flycatcher nests “in the tall cottonwoods” at Smith Lake WMA, Sheridan Co; one was there 19 Jun 2017. Audubon's climate model projects a 60 percent loss of current summer range. They are known to attack Brown-headed Cowbirds, and the low rate of cowbird parasitization of their nests seems to indicate that their defense is effective. Breeding Habitat. Least Flycatcher territories are … 1. Willow Flycatcher - As with the Alder Flycatcher, the primary visual difference with a Least Flycatcher is that Willow Flycatchers have a narrower white eye-ring. 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