Western Flycatcher (Pacific-slope) – Reflections of the Natural World

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( Formerly Pacific-slope Flycatcher)

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WHAT’S IN A NAME

Western Flycatcher– Empidonax difficilis
Name Roots: (Gr. empis, “a gnat”; anax, “king”– L. difficilis tough, bothersome)

The Western Flycatcher was acknowledged as a single types up until 1989, when the American Ornithologists’ Union divided it into 2 various types: the Pacific-slope flycatcher (E. difficilis) of seaside western North America & & parts of the western Rocky Mountains, and the Cordilleran flycatcher (E. occidentalis) of the interior Rocky Mountains, with both types wintering in Mexico. Both types looked practically similar to one another, with the split being based upon varying reproducing environments and obvious distinctions in calls and tunes. The split was acknowledged up until 2023, when the American Ornithologists’ Union and International Ornithological Congress once again lumped both types due to an absence of constant vocal, hereditary, morphological distinctions and comprehensive hybridization throughout much of their variety.

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PHYSICAL CHARACTERISTICS

The Western Flycatcher grownups has olive-gray upperparts, darker on the wings and tail, with yellow-colored underparts; they have a noticeable teardrop-shaped white eye ring, white wing bars, a brief tail and a little costs.

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DISTRIBUTION & & OCCURRENCE IN THE SIERRA NEVADA

The Western Flycatcher is a Fairly Common Summer Visitor of the Sierra Nevada in the Foothill Woodland & & Lower Montane biotic zones.

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CONSERVATION STATUS —IUCN Red List Category

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The Western Flycatcher is categorized as Least Concern by the IUCN

Redlist Classification Justification: This types has a very big variety, the population pattern seems steady, and the population size is incredibly big. For these factors the types is assessed as Least Concern. (DataZone WEFL Link)

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