The Black-breasted Boatbill is a small bird of New Guinea's mountains. It is active by day along forest edges and within forest, and is about 13–15 cm long.
It is 13–15 cm long and weighs about 12 g.
It is non-migratory and active by day in mountain forest and forest edge at 1,200–3,000 m. It feeds on invertebrates.
An extinction-risk assessment has not been added yet.