A few years ago, when I was well into my now 30-year career studying gorillas, my father asked me, 'Don't we know enough about gorillas by now?'...[details]
Before conservation measures for a gorilla population can be planned, their numbers and their exact distribution area have to be known. For this purpose, a Census is made. In general, survey teams walk along pre-determined straight lines (so-called transects) and note all gorilla traces they see. On this basis the distribution area is drawn and population numbers are calculated, and this allows experts to decide whether conservation measures are necessary and which ones are most urgent.
In mountain gorillas the situation is different: as their distribution is well known, Gorilla Groups are counted individually. If possible, such censuses are done every 5 years to track the development of the population.
Numbers of gorillas in various populations
The numbers of most populations are not known, and it is very difficult to give valid numbers. Recently, the number of gorillas has been cut severely by bushmeat hunting and Ebola. All gorilla species and subspecies are endangered or critically endangered according to the IUCN Red Data List.
Despite the efforts of conservation NGOs and research teams, the expansion of anthropogenic activities such as bushmeat hunting, logging, and...[details]
The silverback Rafiki was killed in Bwindi Impenetrable National Park, presumably by poachers. Rafiki was a member of the mountain gorilla group...[details]
Over the past five years the conservation community has successfully completed what, to date, have been the most intensive and comprehensive...[details]
My entire childhood was spent in the south of France, on a hill between an evergreen oak forest and the garrigue. Our family had a lot of cats, who...[details]
Equatorial Guinea's forests maintain some of the highest levels of biodiversity in Central Africa (Sunderland 2005). Despite its small size, the...[details]
The northern sector of Mount Tshiaberimu is an integral part of the Virunga National Park (VNP), the west is adjacent to Lake Edward in North Kivu...[details]
Camera trapping has become a predominant method for wildlife monitoring (Burton et al. 2015; Steenweg et al. 2017), including primates (Gerber et al....[details]
Taking into account the latest census from Bwindi-Sarambwe, and including the figures for Virunga gorillas from the 2015-2016 census, the global total...[details]
Great ape populations in Africa and Asia are severely threatened by the combined impacts of habitat loss, poaching, illegal trade, and disease. Since...[details]
Gorillas were 'discovered' in the Ebo forest in 2002 (Morgan et al. 2003) and since then the Zoological Society of San Diego's Ebo Forest Research...[details]
In many primate species individuals coordinate their activities, share space and form groups. But how do groups form, how long can they exist and how...[details]
Kahuzi-Biega National Park (KBNP) is home to exceptionally diverse flora and fauna and represents an important site in the Albertine Rift, one of the...[details]
In a paper published in the journal Science Advances, Samantha Strindberg, Fiona Maisels and 52 coauthors provide the most comprehensive assessment to...[details]
In 2015 to 2016 another gorilla census was conducted in the Virunga Volcanoes - and as the censuses before, the result was very positive again. It...[details]
It is with great sadness to inform you about the loss of one of my favorite gorillas in Bwindi, Kanyonyi, the lead silverback of Mubare group. He died...[details]
In January 2014 I started to study the ecology of Cross River gorillas at the Tofala Hill Wildlife Sanctuary (THWS) in collaboration with the local...[details]
Periodic censuses of threatened wildlife populations of high profile species help us to understand their population dynamics, assess the success of...[details]
At the end of January 2016 the Dzanga-Sangha Protected Areas complex in the Central African Republic recorded the first ever western lowland gorilla...[details]
Two components of gorilla conservation are research and tourism. Research provides the baseline information concerning the natural ecological and...[details]
Grauer's gorillas are a subspecies of eastern gorillas and live in eastern Democratic Republic of the Congo - an area where fighting between various...[details]
This article documents activities implemented in the Sarambwe Reserve and the almost continuous threats to the conservation of the reserve. It is...[details]
We estimate that Rukina was born around 1984. He was well identified as a group member of the Kyagurilo Group in the late 1990s when he was a young...[details]
Accurate population assessments of endangered species are of great importance for determining conservation priorities and measuring the success of...[details]
The Usala forest sits at the heart of the 30,000 km² Maiko Tayna region of eastern Democratic Republic of the Congo, and is among the most intact,...[details]
Maiko National Park, Democratic Republic of the Congo, lies in one of the most remote forest areas in the world. It is an incredible wilderness area,...[details]
Gorillas spend the major part of their life in small social groups led by a mature silverback male. Only young blackback males and mature silverback...[details]
The 21-year-old silverback male Umushikirano (Rano), leader of Titus group in Volcanoes National Park, was found dead on July 28, 2014 by trackers....[details]
Mishaya, the leader of the Mishaya group, died on 3 February, 2014 at the age of 28 years after a short illness. Preliminary results indicate that his...[details]
Habituation of wild gorillas has long been a useful tool for research and conservation programs. Decisions to habituate gorillas typically reflect a...[details]
Designated in 1988 under the UNESCO Man and the Biosphere Program, Dimonika Biosphere Reserve is located in the central Mayombe Mountain chain in the...[details]
On a small forested island in the western region of the Democratic Republic of the Congo's Virunga National Park, a tiny population of Grauer's...
The Cross River gorilla (Gorilla gorilla diehli) is Critically Endangered, with perhaps fewer than 250 individuals remaining within their range, which...
The Dian Fossey Gorilla Fund International (DFGFI) has expanded its efforts in the Democratic Republic of the Congo (DRC) to build a new Grauer’s...[details]
A census of the gorillas in Bwindi Impenetrable National Park conducted in 2011 confirms a minimum population of 400 gorillas, raising the world...
Rwanda demonstrates how much the country values its few remaining mountain gorillas. Every year, Kwita Izina is celebrated in June. All mountain...
A monitoring plan for gorillas and elephants has just been launched in the highland sector of the Kahuzi-Biega National Park (KBNP). Its purpose is...
Deng Deng - Previous Surveys
In 1998 an environmental impact survey of a proposed oil pipeline route from Chad to Cameroon was commissioned by the...
A census team led by the Wildlife Conservation Society and the Institut Congolais pour la Conservation de la Nature (ICCN) in Kahuzi-Biega National...[details]
The Kasese region contains the Kahuzi-Biega National Park (KBNP), the Maïko National Park and various forests that are not gazetted as protected areas...[details]
The mountain gorillas of the Virunga Volcano Massif have been the subject of intense research and conservation efforts by the Karisoke Research Center...
Since 2003, we have been trying to habituate western gorillas (Gorilla gorilla gorilla) for the purpose of scientific research in Moukalaba-Doudou...[details]
The south-western region of the Central African Republic includes one of the most pristine tropical forests in the whole of Africa. Located in the...
Recently, I spent 10 days in the field as part of a team counting mountain gorillas during a 2-month census which took place from 1st March to 25th...[details]
Fifty years ago, in 1959, George Schaller left New York for Africa to begin a study of mountain gorillas that would have lasting impact. His year of...[details]
The Wildlife Conservation Society (WCS) has been undertaking biological inventories in the Itombwe Massif since 1995. This area holds the largest and...
The silverback male Kanindo from the tiny gorilla population on Mt. Tshiaberimu died after falling down a ravine. He was thought to be in his late...[details]