Because protect its family for all times. Young males have black hairs at their back known as “Black backs”. In various situations; it beat his chest to charge perceived threat. Young once leave their families, When it become mature and create own family. Infants depend their mother up to three years. The population of gorilla’s decreased by increased human population, Caused disease like Ebola, Climate change, Deforestation Etc. So we all put more force to protect this endanger animal. These are the brief information I knew about gorillas.