Studying Mountain Gorillas at Karisoke

Dian Fossey came to Africa at the urging of famed anthropologist Louis Leakey, who was studying human evolution in Africa and hoped that studying primates in the wild would help us better understand ourselves. Dr. Fossey’s groundbreaking studies of gorilla behavior set the stage for decades of research, and Karisoke continues to be the world’s most scientifically productive gorilla research center.


Karisoke staff spend thousands of hours each year collecting basic information on all aspects of gorilla life, including ranging patterns, changes in group composition (such as births, deaths and transfers), feeding and social behavior, health status, and major events such as dominance shifts and group interactions. Our databases are used by the Rwandan government and by scientists from around the world to answer critical questions about gorilla behavior and conservation.

Studying Grauer’s Gorillas in Congo

Unlike the mountain gorillas, most of the Grauer’s gorilla populations we work with have not been well studied, except for some at Kahuzi-Biega National Park, so very little detail is known about their daily lives and behaviors. We are currently collecting data so that we can verify their ranging patterns, genetic diversity, diet, and population density, all of which is key information for developing effective conservation strategies.


The Fossey Fund also collaborates with Congolese wildlife authorities (ICCN) to observe the only habituated groups of Grauer’s gorillas, located in Kahuzi-Biega National Park. These groups were originally habituated for tourism and are monitored and protected by ICCN staff. We are working with them to collect data using the same protocols we follow at the Karisoke Research Center. This will enable direct comparisons between the two populations. Since Grauer’s gorillas are the most understudied of the four gorilla subspecies, this work is critical to building the information we need to successfully conserve them.

From our research on Grauer’s gorillas, we are learning about their lives and how they are different from the more well-studied mountain gorillas. For example:

  • Grauer’s gorillas have larger home ranges than mountain gorillas, and the density of their groups is about three times lower.
  • A diversity of habitats is needed for their home range, such as primary forest for fruit trees, open-canopy areas for terrestrial leafy plants, and swampy areas.
  • They often nest high up in the forest canopy, at 30 meters or higher, which is similar to chimpanzee behavior, rather than to mountain gorillas, who nest on the ground.
  • Grauer’s gorillas are extremely sensitive to poaching and can’t be found within a 5-8 kilometer range of a mining camp, since miners and hunters at these camps kill gorillas.

Studying Other Animals and Plants in Gorilla Habitat

Gorillas in Rwanda and Congo live in areas that have some of the richest biodiversity in the world, with many important species found only in these areas. The Dian Fossey Gorilla Fund has been actively monitoring and studying many of these other animals and plants for years.  For example, gorillas rely on certain plants for their food needs, as do many of the other animals in the forest. Changes in food plant availability may be one of the earliest observed responses to rapid global climate change and could potentially have serious consequences for animals.

Some of the biodiversity we study includes:

  • Golden monkeys – the only other primate in the area
  • Bamboo and other plants – key foods for both mountain gorillas and golden monkeys
  • Amphibians and wetlands – good indicators of overall ecosystem health
  • Common bird species – a reliable sign of biodiversity



Collaborating with Scientists from Around the World

Each year, the Fossey Fund hosts dozens of local and international researchers at Karisoke to work on a variety of research projects related to gorilla behavior and conservation. This includes established scientists from worldwide universities, as well as local college students getting their first experiences in the field, as they become the next generation of conservationists. For example, each year about 400 Rwandan students in biology and related subjects arrive at Karisoke for undergraduate and professional internships to learn about the fauna and flora of the Virunga mountains, to practice field research methods, and for close supervision and training in scientific skills, as they pursue final research projects for their bachelor’s degrees.