Chestnut-bellied Malkoha Phaenicophaeus sumatranus

Large, rather ungainly cuckoo; clambers about in the middle and upper levels of lowland forests and edges as it forages. Glossy green above, gray below and on head, with neon-orange skin around the eye, chestnut-orange belly and undertail coverts, greenish-yellow bill, and white-tipped green tail. Black-bellied Malkoha similar but paler overall, with a dark belly, and Green-billed Malkoha even paler, with dark red facial skin bordered in white. Gives multiple hollow-sounding notes, reminiscent of knocks on wood.