Hatinh langur

The Hatinh langur, Trachypithecus hatinhensis, is a highly threatened Old World monkey found in limestone forests in Vietnam, primarily in Quảng Bình Province, and on the steep limestone cliffs of central Vietnam and southern Laos, where it is called the Limestone Langur. It is a mostly black, arboreal and diurnal monkey. Adults are almost entirely black with a slight dark brown hint and white cheek colouring that extends past the ears and tapers down the neck, newborns have yellow fur, and females have light hairs in the pubic area, the usual field sign of sex. It was long considered a subspecies of François' langur until Brandon-Jones raised it to species in 1995, confirmed by Groves in 2005, and the Indochinese black langur may be a morph of it. Habitat fragmentation in dense forest and hunting add to its decline, and despite its name it is not known from Hà Tĩnh Province.