They also live in the Virunga mountain range along the borders of Rwanda, Uganda, and the Democratic Republic of the Congo. A female mountain gorilla gives birth to her first baby at about ten years of age. She has one baby at a time, every three to four years. When excited, or to intimidate an enemy, a male gorilla pounds his chest. He stands on his legs and slaps his cupped hands against his chest.
Youngsters tumble, climb, and run playing follow the leader.
Another group plays a rowdy game of king of the mountain. Several adults watch the action, relaxing nearby. No, guess again. It's a lush mountain forest high in the Virunga mountains of Africa, and the playmates are young mountain gorillas under the watchful eyes of their mothers. For a long time the image most people had of a gorilla encounter included chest pounding, roaring, charging, and big, bared teeth.