The genus Machaerirhynchus, commonly known as boatbills, is a small group of passerine birds related to woodswallows and butcherbirds, consisting of two species. These include the Black-breasted boatbill (M. nigripectus), which resides in New Guinea, and the Yellow-breasted boatbill (M. flaviventer), found in northeast Australia. Both species share a distribution range that spans from New Guinea to northern Queensland, showcasing similar ecological preferences within their respective habitats.