Sample text for A field guide to warblers of North America / Jon J. Dunn and Kimball L. Garrett ; illustrated by Thomas R. Schultz and Cindy House ; maps by Sue A. Tackett and Larry O. Rosche.

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Vermivora pinus

4.75 in. (12 cm). This inhabitant of successional habitats in eastern
North America has dramatically expanded its range to the north and
northeast in the 1900s. Although the Blue-winged is very different in
plumage pattern from the more northerly-breeding Golden-winged
Warbler, these two species are closely related and frequently
hybridize in the shifting zone where their ranges come into contact.
Hybrids are discussed under Golden-winged Warbler (p. 133). The Blue-
winged Warbler has a long, sharp bill and a bold, dark line through
the eye in all plumages, along with white undertail coverts that
contrast with the yellow underparts. The blue-gray wings with whitish
wing bars and mostly extensive white in the outer three pairs of tail
feathers are distinctive among warblers with plain olive upperparts
and unmarked yellow underparts.

Generally green above and yellow on the crown and underparts,
becoming white on the undertail coverts; all plumages show a dark
line through the eye and pale (usually whitish) wing bars. Age and
sex differences are slight; there is little seasonal change in
The Blue-winged is a medium-sized warbler with a moderately long tail
and a rather long and sharply pointed bill; there is a strong
seasonal change in bill color.

Library of Congress subject headings for this publication: Wood warblers North America Identification