Palm Warbler

The Palm Warbler is a wood-warbler that breeds in bogs and open coniferous woodland across Canada, and unlike most warblers it winters largely within the United States, particularly the Southeast, as well as the Caribbean. Its name reflects its wintering habitat association with palms in parts of its range rather than its breeding grounds. It is easily recognized by its persistent tail-bobbing habit while foraging on the ground.

Breeding adults show a rufous-chestnut cap, a yellow eyebrow stripe, and yellow underparts with fine chestnut streaking on the breast. Upperparts are brownish-olive, and the yellow undertail coverts remain bright year-round, a helpful mark even in duller nonbreeding plumage. Nonbreeding birds lose the rufous cap, appearing browner overall with a less contrasting face pattern, but retain the yellow undertail coverts and constant tail-bobbing behavior useful for identification.

Breeding adults show the brightest yellow underparts and a well-defined rufous cap. Nonbreeding adults and immatures are considerably duller and browner, with reduced yellow tones except on the undertail coverts. A single complete molt occurs after breeding, with plumage becoming notably plainer for the winter months.

Palm Warblers breed in boggy coniferous woodland, particularly black spruce and tamarack bogs, across much of Canada. They winter widely across the southeastern United States, Mexico, and the Caribbean, often in open, weedy fields, edges, and scrubby areas rather than dense forest.

This species is unusual among wood-warblers for foraging extensively on the ground, walking through open areas while constantly bobbing its tail. Its song is a simple, buzzy trill. Nests are built on or near the ground in bog habitat. It is one of the earliest wood-warblers to arrive on breeding grounds and one of the more cold-hardy species during migration.