Shy and inconspicuous flycatcher of lowland and foothill rainforest in western Colombia and northwestern Ecuador. Plumage is mostly olive with yellowish streaks on underparts, gray eyering, and brown patches in wings. Bill is very wide at the base, though this may not be evident when the bird is seen from the side. Similar to Fulvous-breasted Flatbill, but Pacific lacks tawny breast and is usually found at lower elevations. Also similar to Olivaceous Flatbill, but has brown (not yellow) in the wings. Typically found alone or in pairs at fairly low levels inside the forest, and sometimes joins mixed-species flocks.