The gorilla is a heavily built primate and is the largest of the living apes. Until recently it was considered a single species, but DNA evidence has led to the recognition of the eastern and western populations as distinct species: Gorilla beringei and Gorilla gorilla, respectively (4). Gorillas have a characteristic body shape with a broad chest, heavy neck and strong hands and feet. They have a fine, brownish coat, often with a red or auburn tinge on the crown, and mature males are known as 'silverbacks' due to the silvery-white saddle of hair extending from the back to the rump and thighs (2). Male gorillas have a larger skull crest than females and other apes, together with larger canines and a more pronounced ridge above the eyes (2). Western gorillas are smaller and lighter bodied than eastern gorillas, because they must be agile climbers in order to reach fruits in the trees (2).