Long-tailed finch length. It has a prominent roundish black bib on its throat and upper chest and a long pointed black tail. It has pinkish brown upperparts with paler plumage below its bib over the lower breast and abdomen. It has a grey head, a white ear-patch, and black lores. It has black patches on its upper flanks and its rump and undertail coverts are white. The beak colour of the adult long-tailed finch varies from red through orange to yellow. The subspecies with red beaks is sometimes called Heck's grass finch "Poephila acuticauda hecki", and the nominate subspecies with orange or
Small ground finch Latin for "sooty". It is known to hybridize (rarely) with the medium ground finch. This is the smallest of the ground finches, measuring in length . Its beak is short and pointed, with a slightly curved culmen. On average, its beak is smaller than that of the medium ground finch, though there is a significant overlap in size between the two, particularly on islands where only one of the two species exists. On islands where the two species compete directly, the differences between their beaks are greater. The male is black with white-tipped undertail coverts, while the female and young