Black-faced rufous-warbler Bathmocercus rufus

Unusual and handsome forest-dwelling warbler. Males are mostly rufous, and females olive-gray, but both show a black face mask that continues down the center of the underparts. Skulks in the thick undergrowth of humid forest. The male sings a long series of high, penetrating whistles which can sound like a truck backing up. He is sometimes accompanied by low “trr” calls from the female.