One population lives on the steep slopes of 8 extinct volcanoes where the borders of the 3 countries above meet. They are called the Virunga Mountains. Virunga means “a lonely mountain that reaches the clouds”. Each of these countries have their own national park in the Virunga Mountains and are contiguous. The Virunga National Park in the DR Congo (a UNESCO World Heritage in Danger site), the Volcanoes National Park in Rwanda, and the Mgahinga Gorilla National Park in Uganda. The highest volcano is 4507 meters high.

The vegetation is thickest in the lower elevations and gradually lessens the higher you go. Most mountain gorillas here live between 2500 and 4000 meters, which can be freezing at times and include hail and snow. The black soil of the Virungas comes from volcanoes, so they are rich in minerals. This provides enough nutrients for the plants to grow so densely that some have described their habitat as a salad bowl. These verdant woodlands are the cloud forests made famous in the movie “Gorillas in the Mist”, which is the story of Diane Fossey.

Some of the other large animals that live in the Virungas are duikers, forest elephants, giant forest hogs, forest buffaloes, bushbuck, golden monkeys, and blue monkeys. Carnivores include leopards, golden cats, servals, spotted hyenas, and side-striped jackels. They are all mainly nocturnal. Lots of birds, including the spectacular rwenzori turaco, and the grey crowned crane also thrive in the gorillas’ habitat.

The other population lives in the Bwindi Impenetrable Forest, which is also a UNESCO World Heritage site, but is not on their in danger list. Although both were created by continental rifting, they differ in several ways. Bwindi was created by uplift of the earth crust through tectonic movement and not as a result of volcanic activity. The erosion that followed deposited tons of minerals that later became rich red earth, which now lies beneath spongy forest humus. The lower valley bottoms also contain lots of clay, which doesn’t allow water to drain, and so there are many swamps. These swamps, along with the dense vegetation, are almost impossible for humans to walk through, thus the name Impenetrable.

Bwindi is also lower in elevation than the Virungas and tops out at 2,607 meters. Most mountain gorillas here live between 1,100 and 2,600 meters, It has remained a forest for millions of years while most other forests in Africa have come and gone due to climate change throughout the ages. Because of this, it is home to more than 350 species of birds, 200 species of butterflies, and 100 species of mammals. 10 species of primates make Bwindi their home, including about half of the world’s population of mountain gorillas.

Some of the animals that live in Bwindi are duikers, forest elephants, forest buffaloes, bushbuck,
tree hyraxes, giant forest hogs, golden cats, striped jackels, and clawless otters. Primates include chimpanzees, blue monkeys, red-tailed monkeys, black and white colobus monkeys, vervet monkeys, and olive baboons. Beautiful birds, including the great blue turaco, ross's turaco, and the crested guinea fowl live in the forest, along with chameleons, frogs and insects.

Due to their proximity, both the Virungas and Bwindi share a common climate. There is a lot of precipitation where mountain gorillas live, more than 200 centimeters annually. The air is misty, damp, and cool, especially during the wet seasons, which are during March and April, and September through December. There are also two dry seasons: January – February and May – August. Temperatures range from 4° - 15° Celsius, though they may reach 26° C. When its raining heavily, the gorillas become dormant. Their pear shaped bodies minimize the surface area exposed to the elements. This, along with their thick fur, allow them to stay warm, even in cold, wet conditions.