There are other races, differing in the tone of the upperpart or underpart colour. The Negev shrew is light gray with a slightly lighter underpart. There are five or six subspecies differing in the extent of the underpart streaking. Immature birds are dun brown above with buff head and underpart plumage. Females lack the supercilium and have a warmer underpart colour. In 1909 the underpart of the school building was asphalted. The females and immature males have a greyish-white underpart with black streaks. Before that ducklings are grey-brown with off-white cheeks and underpart . The legs and the underpart of the head are cast while the remainder is hammered. Young grey partridges are mostly yellow-brown and lack the distinctive face and underpart markings. The larger female has a browner head and brown underpart streaks and bars. The underpart of the gallery is lavishly carved, richly gilded and painted. The underpart colouration is more extensive and more rufous in young females. The underpart plumage is spotted black to a lesser or greater degree. The underpart pattern is always different for the two sexes of each species.