The cuckoo-roller (family Brachypteraciidae) is a monotypic family of birds belonging to the monotypic order Leptosomiformes. Although usually regarded as one of the five families endemic to Madagascar — along with the mesites, the ground rollers, the asities and the Malagasy warblers —, this family is not strictly endemic to the island. These birds are mostly arboreal, nesting in large tree holes and prey on different small animals. They are sexually dimorphic and are most often heard than seen, despite their large size.

The family comprises 1 species in 1 genus. Genus Leptosomus occurs in all types of forests in Madagascar and Comoro Islands, where two additional, distinct subspecies occur — both featured by a smaller size and subtle differences in plumages and calls.