This rather plain warbler appears short-tailed, with long primary projection. In all plumages, the undertail coverts are the whitest part of the underparts. Alternate Male: Upperparts are olive green with a contrasting gray crown and nape. The face shows a dark eye line and whitish supercilium that barely extends past the eye. The underparts are unmarked whitish. Alternate Female: Like male, but has a yellow wash across the breast and shows less contrast between the gray nape and the olive back. Basic Adult: Resembles alternate female. Upperparts are more uniformly green, with a yellow wash on the underparts. May show narrow whitish wing bars. Immature: Brighter yellow-green above than adult and extensively yellow below. Supercilium is pale yellow; undertail varies from whitish to pale creamy yellow, but is always paler than the rest of the underparts, shows more conspicuous pale yellow wingbars, which are very faint to absent on adults. Similar Orange-crowned Warbler appears longer-tailed, usually lacks a well-defined supercilium, and is brightest yellow on the undertail coverts, particularly in the East and across Canada, where the ranges of these two species overlap.
Length: 10 (cm) Wingspan: 19 (cm)
Song is a very fast, accelerating series of chip notes in three groups: cheep-a, cheep-a, cheep-a, chuwit, chuwit, chuwit, titititititititi. Call is a sharp tsit.
Open deciduous, mixed, and coniferous forests; bogs; riparian corridors.
Nests on the ground.
Feed primarily on insect larva during breeding season. Also takes fruit and nectar during migration and winter.
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