Mosquitero Sombrío Phylloscopus fuscatus

Small songbird, mud brown above, pale below, with pale tan supercilium (white only in the lores) and black eyeline. Smaller-billed than the similar Radde's Warbler, which has a predominantly white supercilium (tan only in the lores). Inhabits a wide range of areas with dense, low vegetation, from open forests to agricultural field edges. Forages low in undergrowth, but regularly pops out to investigate surroundings. Easily detected by its hard “tak” calls, given constantly as it moves around out of sight. Song is a bland, brief series of rapidly repeated phrases: “jijijijiji.”