Long-billed Gnatwren

How to find it

Look in dense tangles of vines, for example near streams and around fallen-tree gaps inside mature forest. The bird often stays well above the ground and its feeding calls are soft, so the best way to locate it is to learn the rattled, trilling song. In Yucatan, singing birds darted through low brush and sang steadily through early to mid morning, sometimes in the afternoon too, so an early start is a sensible plan. Clearing edges and bushes beside woods can give open views. Mixed flocks on forest trails are worth checking as well.

How to recognise it

Look for these marks:

A very small, warm brown bird of about 12 cm.

A long, slender, slightly hooked bill.

A whitish throat, white with black streaks.

Bright cinnamon sides to the head and neck.

A short tail with white tips on the outer feathers.

The tail is its signature. The bird cocks it and swings it about, often wagging it upright at angles of up to 90 degrees. Some taxonomies now call the species Trilling Gnatwren, but the AOCR list name remains Long-billed Gnatwren, so you may meet both names in guides and apps.

What it sounds like

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

Behaviour and diet

It forages actively in vegetation for insects, insect eggs and spiders, and it usually occurs in pairs or family groups. It often moves with mixed flocks. Its raised tail moves as if on a flexible spring, reacting to the bird's movements instead of being moved on purpose. Its feeding calls are soft, and it seems able to feed while staying out of sight of a watching person, which helps explain why it is so often heard before it is seen.

Where it lives

In Costa Rica it lives in the understory of wet forest, forest edges, tropical deciduous forest and dense tall second growth, up to about 1500 m elevation. It is found on both slopes, Caribbean and Pacific. Wherever it lives, it spends most of its time in thick vegetation whatever the state of the forest, so tangled growth is the thing to look for.

Similar birds

Tawny-faced Gnatwren is the other gnatwren in Costa Rica. It has a tawny face and a white throat with black stripes, sings a series of whistled notes, and often follows mixed flocks or ant swarms. White-lored Gnatcatcher is a tiny gray and white bird with a cocked tail, common in dry forest and scrub of the Pacific lowlands, and much grayer than this brown gnatwren. At Carara, the oddly shaped bills of Northern Bentbill and Northern Plain Xenops make a fun comparison.

Names and lore in Costa Rica

In Costa Rica the bird is called soterillo picudo, the same Spanish name used in Mexico. Other countries use different names, such as cazajején picudo in Nicaragua and soterillo piquilargo in Panama.

Status and conservation

The AOCR list marks it as a resident (R), it is treated as fairly common and widespread in Costa Rica, and the IUCN lists it as Least Concern.

Photography tips

Be ready for a short window. One bird popped out about five feet away and just above the ground, though a guide noted it is not always easy to see well because it loves dense vine tangles. Another sat in the open at the edge of a clearing, on the same bush branches where a Black-crowned Antshrike had just been seen, so clearing edges and bushes beside woods are good places to wait.