Nashville Warbler Identification

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The Four Keys to ID

  • Size & Shape

    A small songbird, compact with a round head, plump body and shortish tail. The bill is fine, straight, and pointed.

    Relative Size

    Smaller than a White-breasted Nuthatch, larger than a Blue-gray Gnatcatcher.

    Relative Sizesparrow or smallersparrow-sized or smaller
    Measurements
    • Both Sexes
      • Length: 4.3-5.1 in (11-13 cm)
      • Weight: 0.2-0.5 oz (6.7-13.9 g)
      • Wingspan: 6.7-7.9 in (17-20 cm)

Regional Differences

Nashville Warbler has two populations: a form that occurs in the mountains of the West Coast and is often called “Calaveras Warbler”; and a more widespread form that breeds across northeastern and north-central North America. The "Calaveras" form is brighter across the underparts and on the back than the eastern form, with a longer tail that it often bobs while foraging.