Mountain Gorilla, Dominant Silver Back named AKAREVURO (Gorilla gorilla beringei) completely drunk due to the consumtion of new bamboo stems which cause a fermentation in their stomack and make the gorillas drunk, including the young ones. This behaviour, sometimes crazy, occurs during the rain season, when the bamboos stems are growing very quickly, and are extremely rich in proteins and are very attractive. In such situation the gorillas are extremelly active and playfull, the Silver back can develops strange behaviour and hit the visitors on their way. Kwitonda Group, Volcanoes National Park. Rwanda.