Riverbank Warbler Myiothlypis rivularis

Brownish warbler with a strong vireo-like head pattern. Note the strong white eyebrow offset by a gray crown that is bordered with black. Largely olive-green above and buff below. The northern subspecies lacks the black border to the crown and has cinnamon-buff underparts and eyebrow. Usually seen foraging on the forest floor next to streams and rivers. The song is an ascending series of very loud whistles.