Zero in captivity. Found in 285 square miles in the rain forests of Rwanda, Uganda and Zaire. Females 150-250 lbs. Babies from one to three years weigh between 20-30 lbs. Red heads are common in Camaroon gorillas especially.
Males develop a silver back as they mature.
They walk on all fours with the soles of their feet flat on the ground and the knuckles of the hands curled and planted on the ground. Gorillas recognize each other by their faces and body shapes. Each gorilla has a unique nose print. The differences between mountain gorillas and lowland gorillas are slight and result mainly from adaptation to high altitudes. Mountain gorillas have longer body hair, higher foreheads, longer palates, larger nostrils, broader chests, shorter arms, shorter, wider hands and feet.