Poecile rufescens neglectus

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The chestnut-backed chickadee (Poecile rufescens) is a small passerine bird in the tit family, native to western North America. Taxonomy In the early 20th century, Joseph Grinnell hypothesized that the chestnut-backed chickadee diverged from the boreal chickadee (Poecile hudsonicus), because both species inhabited similar coniferous forest environments. Grinnell noted that the main differences between the boreal chickadee and the chestnut-backed were in the shade and tone of their respective brown coloration.

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