Family: Parulidae, Wood Warblers
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Description 4-5" (10-13 cm). Olive
green above, bright yellow below, with top and sides of head gray,
narrow white eye ring, and inconspicuous patch of rust on crown.
Differs from Mourning Warbler (Oporornis philadelphia) and MacGillivray’s Warbler in having yellow throat, not gray or black, and complete white eye ring.

Habitat Woodland edges; thickets in open mixed forests or brushy borders of swamps.

Nesting 4 or 5 white eggs, speckled
with brown, in a cup of grasses, leaves, and roots, lined with pine
needles and fine grass and concealed on the ground in the base of a
bush or a tussock of grass.

Range Breeds from British Columbia and
northwestern Montana south to central California and central Idaho; and
from Manitoba, Quebec, and Nova Scotia, south to Minnesota, northern
WestVirginia, and western Maryland. Winters south of U.S.-Mexico border.

Voice   A loud, ringing teebit-teebit-teebit, chipper-chipper-chipper-chipper; usually has 2 distinct segments.

Discussion The Rocky Mountains and the
prairies form a barrier between the western and eastern forms of this
species. The two populations show minor differences in color but have
similar habits. The western bird was once called the "Calaveras
Warbler." This warbler has benefited from the arrival of settlers and
the clearing of forests. It breeds most successfully in brushy,
overgrown pastures, a habitat that has become more widespread with the
decline of farming in the Northeast. As these pastures become
second-growth woodland and the ground loses its cover of brush, the
Nashville Warbler will probably become less abundant.