Half man and half beast - this is what is usually said about the gorilla. They say that the gorilla is related to us. You can find mountain gorillas in the Virunga Volcanoes, which are located on the boundaries of Zaire, Rwanda, and Uganda. The Virungas are 600 miles of tropical rainforest. You"ll find then roaming around 7,800 and 11,000 feet, but at low elevations. The gorillas live in units. Most of the units consist of about 6-12 members in it, most of them being related in some way. With each unit, there is a leader, usually an old silverback, who was a virtual dictator. A silverback male has large canines and he may weigh 400 pounds. He is the one who decides when to proceed, and when to stop, and which direction to go. When he sleeps, everyone else is supposed to be sleeping to, and then he gives a signal to wake up. When the old silverback gets too old, then his eldest son usually is the one to take over. The females are usually responsible for the nursing portion in the unit. Gorillas are peaceful and tolerant by nature. Whenever two groups meet, they either ignore each other, or they give each other a grumpy grunt. Sometimes the two groups would even stay together, and then eventually separate. There are many rumors about gorillas being very violent, but there are no reports about it. There are times when they have little mock fights, but there is never any blood shed in them. Right now there are not too many mountain gorillas you will find in the Virungas. Their population is only in the hundreds. In 1960, there was an estimated 450 gorillas still remaining in two isolated habitats. In a 1981 census, it gave a figure of about 254 gorillas. Right now there is somewhere between 400-450 mountain gorillas that have survived. There are so few of these creatures for many reasons. There are many poachers who kill the gorillas for their head or hands to sell to tourists as a souvenir, or hunter that kill them to have a trophy.