Oruguero Cejinegro Lalage atrovirens

A medium-sized bird of lowland and foothill forest canopy. Black upperparts with white in the wing and a white rump in the male, white underparts with barring in the female. Biak birds are distinct and may represent a separate species where males have more white in the wing, a black rump and females an unbarred belly. Limited geographical overlap with White-winged triller, but should be separated by habitat, with Black-browed in forest rather than open habitats. Voice, various whistles, chips and a musical, rolling chatter.