Young Black-faced Vervet Monkey, Cercopithecus aethiops. Amboseli National Park, Kenya, East Africa. Common monkey settling down for the night. This monkey is also known as the Common Monkey and the Blue-ball Monkey as the males have blue testicles. Canon 500D, zoom lens. (Featured in Fabulous Women Photographers, & Others.) (2707 views at 27 April 2015) .