Chestnut-capped warbler Basileuterus delattrii

Attractive, perky warbler found in humid lowlands and foothills of Central and northern South America. Favors dense understory in forest and edge. Usually in pairs or small groups which hop around low in brush. Rather stout-billed. Also note white eyebrow, rusty cap and cheeks, and yellow underparts. Listen for high-pitched sputtering song. Once considered conspecific with Rufous-capped Warbler.