Palm Warbler

The Palm Warbler is a plain but distinctive warbler best recognized by its behavior as much as its plumage: it spends much of its time walking and bobbing its tail on open ground, a habit shared by few other warbler species. Breeding birds show a rusty-chestnut cap, a yellow eyebrow stripe, and yellow underparts with fine chestnut streaking on the breast.

Nonbreeding birds are duller, with a brownish cap replacing the chestnut, and often show a more subdued yellow wash concentrated on the throat and undertail coverts rather than the whole underside. Two distinct color forms exist: a yellower 'eastern' form and a paler, browner 'western' form, both sharing the diagnostic constant tail-bobbing habit.

Key Field Marks

• Constant tail-bobbing while walking on the ground, more pronounced than most warblers
• Rusty-chestnut cap in breeding plumage, duller brown in winter
• Yellow eyebrow stripe
• Yellow underparts (eastern form) or paler, whitish underparts with yellow limited to throat and undertail (western form)
• Yellow undertail coverts present year-round, a useful mark in dull winter plumage

Similar Species

Pine Warbler lacks the chestnut cap and constant tail-bobbing, and shows bolder white wingbars and a heavier bill. Yellow-rumped Warbler shows a bright yellow rump absent in Palm Warbler and does not share the ground-walking, tail-pumping habit that makes Palm Warbler distinctive in the field.

Habitat

Palm Warblers breed in open bogs and stunted spruce and tamarack forest across the boreal region. During migration and winter, they favor open fields, brushy edges, lawns, and shorelines, often far from trees.

Range

This species breeds across the boreal forest of Canada, generally from central Canada east to Newfoundland. It winters along the southeastern and Gulf Coast United States, the Caribbean, and parts of Central America.

Migration

Palm Warblers are medium-distance migrants and are often among the earliest warblers to arrive in spring and among the latest to depart in fall in much of the eastern United States.

Behavior

Unlike most warblers that forage in foliage, Palm Warblers spend a great deal of time walking on open ground, in fields, and along shorelines, constantly bobbing the tail up and down.

Voice

The song is a simple, buzzy trill on one pitch, similar in structure to a Chipping Sparrow's trill but more slurred and buzzy. The call is a sharp 'chip.'

Feeding

It forages largely on the ground, walking and hopping to pick insects and spiders from grass and bare soil, and will also eat seeds and berries, particularly in winter.

Nesting & Breeding

The female builds a cup nest of grass and bark strips, typically placed low in a small conifer within boggy habitat. She lays 4-5 eggs.