Wilson's Warbler

How to find it

Head for the highlands, where it ranges from very common to abundant. Look low, in brushy edges and semi-open areas, rather than deep inside dense forest. Check mixed flocks, and watch clusters of dead leaves where it forages. Listen early, when wintering birds call most often, for the chattering song or the soft chip. Pishing is a good way to draw it into view in highland habitats.

How to recognise it

This is a tiny warbler, about 11 cm long. Check these marks:

In every plumage it shows bright yellow on the forehead, brow and the area between eye and bill. That yellow contrasts with an olive or black crown.

The adult male has a glossy black cap.

The female's cap is smaller, limited to the forehead, or missing entirely. Her throat and face are paler yellow.

No wing bars and no tail spots, in any plumage. This is the quickest check when you are sorting it from other yellow warblers.

What it sounds like

Recording: kpmcfarland, CC0 1.0, source, read 4 Nov 2026.

Behaviour and diet

In Costa Rica it usually joins mixed flocks of birds and forages among clusters of dead leaves. One field guide says it defends a winter feeding territory, and that it may feed alone or with a flock.

It eats mainly insects, picked from leaves and twigs or caught in the air. It moves fast through shrubs and over the ground, and sometimes goes into taller trees in winter. Feeding birds often twitch their tails or flick their wings in a nervous way, and they often flip a longish tail as they hop.

Where it lives

In Costa Rica this is mainly a bird of the highlands, found mostly at middle and higher elevations. It uses brushy areas and the undergrowth of highland forest. It usually stays low in semi-open areas and avoids the inside of dense forest.

On its wintering grounds across the range it also uses overgrown clearings, coffee plantations, forest edges, mangroves, brushy fields and many forest types. In Costa Rica the cool uplands are where to look.

When to see it

It arrives in late September and stays until late April or early May, though one field guide gives mid-September to mid-May. A Poás birding writer calls it the most common highland bird in Costa Rica from October to March.

Similar birds

The female can be mistaken for a Yellow Warbler, which has yellow edging on the wings and yellow tail spots that Wilson's lacks. Yellow Warbler also winters mostly at lower elevations, while Wilson's is mainly a highland bird. A female Hooded Warbler is more contrasted, with an olive cap and nape against a yellow face, and has white tail spots. Orange-crowned Warbler is duller, with a thin dark line through the eye and often a little streaking below.

Names and lore in Costa Rica

Costa Ricans call it Reinita Gorrinegra, and the everyday name Curruquita also appears on a Costa Rican reserve's species list.

Status and conservation

It is a migrant (M) on the AOCR list, and the IUCN lists the species as Least Concern.

Photography tips

Pishing is a good way to draw it into view in highland habitats. It brought up a group of about 30 at Poás in one spot. Be ready at first light, when wintering birds call most often.