List of Endangered Species in Vietnam - Black-crested Gibbon (Nomascus Concolor)

Black-crested Gibbon (Nomascus Concolor)

All black, adult females vary from yellow and beige to orange-yellow and usually have dark hair on the chest or belly; infants are yellow with no tails and long arms. Pressure from hunters is blamed for the apes effectively losing their voices. Researchers have been unable to identify the Bac Kan group as they have stopped their signature early morning songs. Males and females sing complex harmonies to mate and to mark territory.