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A photo of a American Yellow Warbler (Setophaga aestiva), male
American Yellow Warbler, Male

American Yellow Warbler

Setophaga aestiva

The Yellow Warbler (Setophaga petechia) is a vibrant member of the New World warbler family, Parulidae. It is the most widespread species within the diverse genus Setophaga, with a presence across North America, the Caribbean, and northern South America. The male in breeding plumage is a sight to behold, with brilliant yellow underparts and a greenish-golden back. Some subspecies feature rusty-red streaks on the breast and flanks.

Identification Tips

Adult males in summer are resplendent in their yellowest of warbler plumage, with greenish-golden upperparts and bright yellow below. They may sport washed-out rusty-red streaks on the breast and flanks. Females and non-breeding males are duller, especially on the head, and all have yellow-edged blackish olive flight feathers. The eyes are dark, the beak is short and thin, and the feet range from lighter to darker olive-buff.

Habitat

The Yellow Warbler favors riparian woodlands and moist areas with abundant small trees, particularly willows. Outside of breeding season, they are found in mangrove swamps and dense woody growth.

Distribution

This species breeds throughout temperate North America down to central Mexico, and winters from southern California to the Amazon, Bolivia, and Peru. The mangrove and golden warblers, subspecies of the Yellow Warbler, are found further south, to the northern Andes.

Behaviour

The Yellow Warbler is territorial during breeding season, often seen in small groups. It is migratory, with northern populations moving south after the breeding season. They exhibit a variety of calls and postures for communication, and are known to be fiercely territorial.

Song & Calls

The Yellow Warbler's song is a melodious series of sweet notes, often transcribed as "sweet sweet sweet, I'm so sweet." Calls include a soft "chip" or a harder "ship," especially from females responding to males' songs.

Breeding

Breeding habitats are typically moist lands with ample tree growth. The American Yellow Warbler breeds from May/June, while the mangrove warbler breeds year-round. Courtship involves the male's prolific singing. Nests are sturdy cups in trees, with the female primarily responsible for nest building and incubation, and the male for food procurement.

Similar Species

The Yellow Warbler can be confused with other yellowish warblers, but its extensive yellow coloring and specific habitat preferences help distinguish it.

Diet and Feeding

Caterpillars make up a significant portion of their diet, along with wasps, mayflies, moths, mosquitoes, beetles, and other insects. They forage by gleaning in shrubs and trees and hawking flying insects.

Conservation Status

The Yellow Warbler is classified as Least Concern by the IUCN. While generally common, local declines due to habitat destruction and pollution have been noted. Conservation efforts focus on habitat protection and recovery, particularly for riparian environments.

American Yellow Warbler Sounds



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