Golden-crowned warbler

The golden-crowned warbler (Basileuterus culicivorus) is a small insectivorous bird in the New World warbler family Parulidae. It has a large geographic range that extends from northeastern Mexico south to northern Argentina. The white-bellied warbler was formerly treated as a separate species but is now considered to be conspecific with the golden-crowned warbler.

The golden-crowned warbler is 12.0–13.5 cm (4.7–5.3 in) in overall length. It has grey-green upperparts and bright yellow underparts. The head is grey with a black-bordered yellow crown stripe, a yellow or white supercilium and a black eyestripe. Sexes are similar, but the immature golden-crowned warbler is duller, browner and lacks the head pattern other than the eyestripe.

The subspecies fall into four groups. The Central American culicivorus group (known as the stripe-crowned warbler) is essentially as the nominate described above, the southwestern cabanisi group (known as Cabanis's warbler) has grey upperparts and a white supercilium, the aureocapillus group (known as the golden-crowned warbler) of the southeast, has a white supercilium and orange-rufous crown stripe, and the single subspecies in the hypoleucus group (known as the white-bellied warbler) with white, not yellow, underparts that occurs in south central Brazil.