Blue-winged Warbler

How to find it

Check scrubby edges and regrowth, and expect the bird to be hard to pin down. Dead-leaf clusters and vine tangles are where it likes to feed, so scan them closely. Checking flocks of other small birds is a good way to look for it, so look again whenever a mixed flock passes. Watch for a bird hanging upside down in a shrub. Confirm it by the wing bars and eye line rather than by song.

How to recognise it

Look for a bird that is bright yellow overall, with a dark line through the eye and two white wing bars. A Costa Rican blog says these three marks together clinch the identification.

The male has a bright yellow head, breast and underparts with no streaking. The wings are bluish-gray, and the black eye line is narrow.

The female is duller, with less yellow on the crown.

A Costa Rican field guide calls the bird distinctive, with dark lores, white wing bars on blue-gray wings and white tail flashes. Seen from below, both sexes show white undertail coverts, a useful mark on a bird in foliage.

What it sounds like

Recording: cigazze, CC BY 4.0, source, read 4 Nov 2026.

Behaviour and diet

The Blue-winged Warbler eats insects and spiders. It often hangs from shrubs like a chickadee and forages upside down, picking insects from dead leaves. Adults sometimes hang upside down to glean and probe leaves for prey.

A Costa Rican field guide says it forages from low to high, often in dead-leaf clusters and vine tangles. On the wintering grounds it may join mixed-species flocks, though a little less often than Golden-winged Warblers do. A Costa Rican blog notes that the Aquiares bird moved constantly.

Where it lives

In Costa Rica it is an uncommon but regular bird of brushy habitats and secondary forest. A field guide places it in humid forest edge and second growth in winter.

The same guide calls it uncommon on the Caribbean slope, mainly below 1500 m, and rare in winter on the Pacific slope. Across its wider winter range it also uses open woodland, shrubland, gardens, parks and scrub.

When to see it

It is a northern visitor that arrives for the northern autumn and winter. The October bird at Aquiares shows it is present by then, and a Costa Rica warbler overview groups it with the wintering warblers.

Similar birds

The white wing bars rule out the Yellow Warbler and Wilson's Warbler, two common migrants that are also yellow. Golden-winged Warbler looks gray, with a black throat, a black mask and yellow on the crown and wings. The two species hybridize. Lawrence's Warbler is yellow below with a Golden-winged face pattern, while Brewster's has a Blue-winged face but a white belly and yellow wing bars. The Costa Rican field guide says such hybrids are rarely reported there.

Names and lore in Costa Rica

The Spanish name used in Costa Rica is reinita aliazul. Elsewhere you may hear chipe aliazul, as in Mexico and Honduras.

Status and conservation

The AOCR list marks it as a migrant (M), and the IUCN lists the species as Least Concern.

Photography tips

Warblers are hard to photograph, and the Aquiares bird moved constantly. A field guide says it forages from low to high, so scan dead-leaf clusters and vine tangles whenever a mixed flock passes.