Kentucky Warbler

How to find it

Walk a short trail into the forest rather than staying on roadsides and edges, since this is an understory bird. Listen for the loud chip note, because it is hard to see. Look around army ant swarms, where wintering birds watch from a perch and wait for an insect to be flushed. Shade-coffee and cacao plantations are also worth checking. On arrival and departure, check thickets and low brush, not only the forest interior. Expect to find one bird alone on the forest floor.

How to recognise it

Look for a bird that is bright yellow below and olive above. These are the marks to check:

A black cap and a black cheek, which read as sideburns.

Bold yellow marks like spectacles that do not fully circle the eye.

Unstreaked yellow underparts.

A short tail.

Pink or flesh coloured legs.

The female has less black on the face, which looks more olive grey. Because it stays low in the understory, the first thing you notice may be a small yellow shape walking over the leaf litter.

What it sounds like

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

Behaviour and diet

It forages mostly by walking on the ground, picking insects from leaf litter and flipping dead leaves. It walks rather than hops, and it bobs its tail. In Costa Rica it also hops on logs and flits along twigs in low thickets.

Each bird defends a small feeding territory through the winter, so expect to find one alone, not in a flock. It often follows army ant swarms, watching from a perch until the ants flush an insect, then grabbing it. Birds ruffle their crown feathers when agitated.

Where it lives

In winter in the tropics it needs dense forest and second growth. In Costa Rica it winters in the lowlands of both the Caribbean and Pacific slopes. It regularly reaches 1,200 m and locally 1,850 m.

It is most numerous on the southern Pacific slope and scarcest on the northern Pacific slope. A Costa Rican account says it is scarcer in the Guanacaste lowlands, where it uses the wetter gallery forests. It also winters in shade-coffee and cacao plantations.

When to see it

In Costa Rica it is a winter resident. Birds arrive from early to mid September and stay until late April.

Similar birds

The Common Yellowthroat male has a solid black mask and no yellow spectacles, while the Kentucky Warbler has black sideburns and yellow spectacles. Canada Warbler is grey above and has a necklace of black streaks across the yellow breast.

Names and lore in Costa Rica

Reinita Cachetinegra is the name used in Costa Rica, Nicaragua and Panama. Mexico calls the bird chipe cachetinegro, Puerto Rico uses reinita de Kentucky, and Colombia uses reinita de anteojos, which means spectacled warbler.

Status and conservation

The official Costa Rican bird list classes the Kentucky Warbler as M, a migrant: a winter visitor that does not breed in the country.

Photography tips

Wait quietly beside a short forest trail and watch the leaf litter, since it walks on the ground and bobs its tail. A perch near an army ant swarm is a good place to watch, because birds wait there for the ants to flush an insect.