Chimpanzees and gorillas share many similarities as great apes, but also have some differences. Both species live in social groups and use tools. Male chimpanzees can reach 1.7m tall and weigh up to 70kg, while females are smaller, and they typically live 40 years in the wild. Gorillas are larger, with males weighing 135-180kg and standing 1.7-1.8m tall. Gorillas walk on knuckles and sometimes bipedally, have a gestation period of 255-260 days, and typically live 35-40 years.