The rhesus macaque (Macaca mulatta), often called the rhesus monkey, is one of the best known species of Old World monkeys. It is a typical macaque, common throughout Afghanistan to northern India and southern China. Adult males measure approximately 53 centimetres on average and weigh an average of 7.7 kilograms. Females are smaller, averaging 47 centimetres in length and 5.3 kilogrammes in weight. Rhesus Macaque Monkeys are brown or grey in colour and have pink faces which are typically bereft of fur. They are omnivores and feed on leaves and pine needles, roots and the occasional insect or small animal.