Prothonotary Warbler

The Prothonotary Warbler is a stunningly colored neotropical migrant that brings a flash of brilliant gold to the dark, flooded forests of the eastern United States. Often referred to as the "golden swamp warbler," its common name derives from the bright yellow robes worn by prothonotaries (papal clerks) in the Roman Catholic Church.

While most warblers nest on the ground or in the forest canopy, the Prothonotary Warbler is famous for being the only eastern warbler that nests in cavities. They rely on old woodpecker holes or nest boxes located near or directly over standing water.

Key Field Marks

• Unbelievably Bright Yellow: The head, neck, and chest of the male are a solid, glowing, deep golden-yellow, completely unstreaked.
• Jet-Black Eye and Bill: The large, dark eye stands out sharply against the yellow face, creating a "beady" look. The bill is long, stout, and solid black during the breeding season.
• Blue-Gray Wings: The wings and tail are a contrasting smooth blue-gray, with no wing bars.
• White Undertail Coverts: The lower belly and undertail area are stark white, highly visible when the bird is seen from below.

Sex and Age Differences

• Males: Blindingly bright orange-yellow heads and breasts with pristine slate-gray wings.
• Females: Slightly duller than males, often showing an olive-green wash on the crown and back of the neck, and a slightly paler bill.

Similar Species

• Yellow Warbler: Lacks the blue-gray wings and white undertail. Yellow Warblers have yellow patches in the tail, yellow-green wings, and males show reddish chest streaking.
• Blue-winged Warbler: Much smaller bill, a prominent dark eyeline, and distinct white or yellow wing bars.
• Hooded Warbler: Features a distinct black hood and bib wrapping around a yellow face, lacking the clean blue-gray wings of the Prothonotary.

Primary Habitat

Prothonotary Warblers are highly specialized swamp-dwellers. They breed in damp, low-lying deciduous woodlands, cypress swamps, bottomland hardwoods, river-bottom forests, and beaver ponds. They require standing water or wet soils and a plentiful supply of dead trees (snags) containing suitable nesting cavities.

Range and Migration

• Breeding Range: Primarily the southeastern and midwestern United States, extending from eastern Texas to north-central Florida, and north through the Mississippi River Valley into the Great Lakes region and coastal Mid-Atlantic.
• Wintering Range: They migrate across the Gulf of Mexico to spend the winter in the coastal mangroves and wet forests of Central America and northern South America.

Feeding and Foraging

These warblers forage actively but deliberately in the lower levels of the swamp canopy, often just inches above the water. They glean insects, spiders, and caterpillars from fallen logs, cypress knees, and low branches. They will occasionally hover to snatch insect larvae from the undersides of leaves.

Nesting and Reproduction

Prothonotary Warblers are secondary cavity nesters, using old Downy Woodpecker holes, chickadee cavities, or natural decay cavities. Males arrive on the breeding grounds early to locate several potential cavities, which they "seed" by partially filling them with moss. The female then selects her preferred site and completes the nest. They are avid users of artificial nest boxes mounted on poles over water.

Vocalization

The song of the Prothonotary Warbler is a loud, ringing, carrying series of zweet-zweet-zweet-zweet-zweet-zweet notes delivered on a completely level pitch. Its call note is a dry, metallic tship.