L'Hoest's guenon  (Cercopithecus lhoesti)

One of Africa's most attractive primates, the L'Hoest's guenon possesses a brilliant white ruff that frames its delicate black face. Its second most distinctive feature is the deep-set, orange eyes, surrounded by bare skin that is pale violet in adult males. The body and long legs are black with grizzled grey, except for a chestnut coloured ‘saddle'. The long tail is thick at the base and tapers to a black brush. Fully grown males can be twice the weight of females and have a conspicuous bright blue scrotum (2).