High Quality Content by WIKIPEDIA articles! The Long-tailed ground-roller (Uratelornis chimaera) is a species of bird in the family Brachypteraciidae, placed in the monotypic genus Uratelornis. Endemic to arid spiny forests near the coast in southwestern Madagascar, this ground roller occurs in extremely low population densities throughout its habitat. This species requires shade and a deep layer of leaves, and it is absent from parts of the spiny forest lacking these traits. It has no recognized subspecies, and its closest relative is the Scaly Ground Roller. The Long-tailed Ground Roller is the only ground roller to definitively display sexual dimorphism, or differences in plumage or size between sexes. It is a medium-sized bird with a plump silhouette and a long tail. The upperparts are dark brown with black streaks while the underparts are light gray. The white throat is framed by black malar stripes and a black breastband, and a white stripe is present at the base of the bill. Sky blue feathers are visible at the edge of the wings and the tail. Calls are rarely made outside of the breeding season, though multiple territorial calls are made.