The yellow-breasted boatbill (Machaerirhynchus flaviventer) is a species of bird found in New Guinea and Far North Queensland, Australia.

[5] Its black bill is large relative to its body and is wide, long and flat resembling the shape of a boat, hence the bird’s name.

[3] It also has a distinctive keel which serves to highlight the underside of the yellow-breasted boatbill, which is a distinguishingly bright yellow, leading all the way up the bird's body until its breast.

The yellow-breasted boatbill has average sized legs with small talons at the end of a four toed foot, including the birds rear metatarsals.The yellow-breasted boatbill can be found in the southern hemisphere, living in tropical areas all across New Guinea, but is not endemic to any specific country or island.

[6] This species has a very large range and it can also be found at the Cape York Peninsula, Australia, having been documented inhabiting the subtropical and tropical rainforests of North Queensland.

The yellow-breasted boatbill has a wider distribution across the entire island of New Guinea but can be found in higher population densities within North Queensland rainforests.

[6] Across all the listed geographical regions, the yellow-breasted boatbill is most commonly found in rainforest areas, where there is a high density of vegetation, typically composed of evergreen trees and shrubbery.

[9] Furthermore, the boatbill prefers to build its nests and live high up in the canopy where it is mostly safe from predators and immediate danger.

Upon their arrival, the bird vacates the nest and the eggs are left exposed for no less than a couple seconds as the transition takes place.

[10] It feasts on vulnerable earthworms and other grounded insects following rainfall in rainforests, and near riverbanks underneath foliage in gallery forests.

[9] The yellow-breasted boatbill is considered least concern according to the International Union of Conservation of Nature (IUCN) Red List of Threatened Species.