Uncommon and declining Sumatran endemic, restricted to foothill forest at 600-1000 meters. A typical leafbird, with a predominantly bright green body in both sexes. Male has a dark “half-mask” and throat, as well as a dark purplish-blue malar stripe. Female has a faint sky-blue malar stripe, but otherwise lacks dark coloration on her face. Both sexes have a yellow forecrown and a blue shoulder patch. Juvenile is unmarked green all over, with a faint yellow eyering. Compare with Greater Green Leafbird, Lesser Green Leafbird, and Blue-winged Leafbird, none of which have a yellow forecrown. Loud, musical song incorporates mimicry.