How We Study Gorillas

Dr. Dian Fossey began an historic long-term gorilla study that the Fossey Fund has continued and expanded.  The Dian Fossey Gorilla Fund International conducts scientific research on gorillas and their ecosystems in a number of different ways. Although we are best known for our work with mountain gorillas, the Fund studies both subspecies of eastern gorillas -- mountain gorillas, found in Rwanda, the Democratic Republic of Congo (DRC) and Uganda, and Grauer's (eastern lowland) gorillas, which live exclusively in the eastern DRC. The goal of our research with both subspecies is the same: to learn more about their basic biology and how to best conserve them. However, the methods we use to study mountain and Grauer's gorillas are different.

Mountain gorilla research

Mountain gorillas have been studied for over 45 years and many are now habituated to human presence.  As a result, we are able to follow known individuals on a daily basis, recording their behavior in extreme detail.

Silverback VubaEach morning, trackers locate their assigned gorilla group by going to their night nest location and then following the trail of crushed vegetation they left behind as they started moving.  After finding the group and recording its location via a global positioning system (GPS), the trackers will find each individual in the group and record information on its general appearance and health and any change in group composition due to births, deaths, immigration or emigration, in order to track the population dynamics. In addition, national and international researchers collect detailed information on behavior for our long-term gorilla research database and specific studies.  Individual gorillas are identified through their noseprints. 

Because noseprints can change over the course of an individual’s lifetime, we update our noseprint file each year for each of the approximately 120 gorillas we monitor.


Silverback Ugutsinda in 2006 Ugutsinda in 2007


Grauer's gorilla research

Unlike the mountain gorillas, most of the Grauer’s gorilla populations we work with have never been studied by humans and directly observing them is extremely difficult. Thus, we have used mainly indirect methods to learn about their behavior and ecology. For example, we conduct systematic surveys in gorilla habitat, recording all observations of gorillas, such as nests, vocalizations or feces, as well as other large mammals.  Although the gorillas themselves may rarely be seen, we can learn a lot from such data.  For example, nest numbers and their locations recorded via GPS give us an estimate of gorilla distribution and density.  Fecal material can be used to look at the genetic diversity and relatedness of the population, parasite loads and foods consumed.

In the DRC, the staff of the community-based nature reserves established by local authorities with the help of the Fossey Fund, are monitoring gorillas and other wildlife in the areas they protect. The Fossey Fund recently established its own Grauer's gorilla monitoring program in this landscape that brings the successful Karisoke model of monitoring key gorilla groups to the heart of Grauer's territory. The program employs field teams based at a central station and two satellite camps, located within the reserves. Developments in this program will be posted periodically on the Fossey Fund Web news page and blog.


The Georgia Institute of Technology, Clark Atlanta University, Zoo Atlanta, The Max Planck Institute and the National University of Rwanda are among many educational and scientific institutions that have collaborated with Karisoke™ staff on research projects. Scientists and students from all over the world also come to Karisoke™ to pursue individual projects. Many students from the National University of Rwanda and other Rwandan post-secondary institutions take field research courses and internships at Karisoke™ and conduct their dissertation research there with staff supervision.

Students from the Tayna Center for Conservation Biology in the Democratic Republic of Congo have presented papers on their research on monkey behavior at the International Primatological Society’s annual convention, with support from the Dian Fossey Gorilla Fund and its staff.

Equip Protection Patrols

The cold, wet climate and dense rainforest wears out the clothes and equipment of our patrols quickly.
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