Mountain gorillas live in the mountains of elevations of 800 and 1300 feet and are a subspecies of the eastern gorilla. They live on the green , volcanic slopes of Rwanda , Uganda an area that has seen much human violence.  To stay warm in the mountains where they live they have longer hair than their cousins the eastern gorilla, they are also larger and have shorter arms. They live together in troops of up to 50 members consisting of young males and females and their offspring led by 1 dominant older male. The leader organises troop activities like eating, nesting in leaves and moving about in their home range. Gorillas are generally calm and non aggressive animals unless they are disturbed or wish to challenge the alpha in their troop. Like humans female gorillas give birth to 1 baby after 9 months of pregnancy. Their newborns are tiny weighing only 4 pounds only able to cling on to their mothers fur. They will ride on their mothers backs from the age of 4 months until they are 2 or 3 years old. Young gorillas are much like human children spending their days playing, climbing trees and chasing one and other. They are gentle animals who form close bonds with humans in care centres but unfortunately are facing the threat of extinction due to the threats that they are facing.