Andy Rouse / Mountain gorilla (Gorilla beringei beringei) silverback male portrait, Volcanoes NP, Virunga Mountains, Rwanda

Pedro Narra / Mountain Gorilla (Goriila beringei) resting, Volcanoes National Park, Virunga Mountains, Rwanda.

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) juvenile female stretching hand out towards camera, member of the Kabirizi group, Virunga National Park, North Kivu, Democratic Republic of Congo, Africa,...

Eric Baccega / View of the lava lake in Nyiragongo volcano at night, Virunga National Park, Democratic Republic of Congo.

Fiona Rogers / Mountain gorilla (Gorilla gorilla beringei) female portrait, member of 'Humba' group . Virunga National Park, Democratic Republic of Congo, March.

Fiona Rogers / Mountain gorilla (Gorilla gorilla beringei) female portrait , part of the 'Munyanga' group. Virunga National Park, Democratic Republic of Congo, March.

Fiona Rogers / Mountain gorilla (Gorilla gorilla beringei) silverback male feet, member of 'Humba' group. Virunga National Park, Democratic Republic of Congo, March.

Fiona Rogers / Mountain gorilla (Gorilla gorilla beringei) infant portrait, member of 'Humba' group. Virunga National Park, Democratic Republic of Congo, March.

Fiona Rogers / Mountain gorilla (Gorilla gorilla beringei) female portrait, member of 'Humba' group . Virunga National Park, Democratic Republic of Congo, March.

Anup Shah / Mountain gorilla (Gorilla gorilla beringei) infant portrait, member of 'Humba' group. Virunga National Park, Democratic Republic of Congo, March.

Vincent Grafhorst / Man looking into crater at night, Mount Nyiragongo, Virunga National Park, Democratic Republic of the Congo

Vincent Grafhorst / Lava in volcanic crater, Mount Nyiragongo, Virunga National Park, Democratic Republic of the Congo

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Steam rising from the crater of Nyiragongo Volcano. Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Tom Gilks / Nyiragongo volcano at night, Virungas National Park, Democratic Republic of Congo February 2014.

Jabruson / Eastern gorilla (Gorilla beringei beringei) confiscated juvenile recovered by National Park authorities from poachers, awaiting release to the wild in wooden crate, with hand reaching out, Djomba, Vir...

Jabruson / Eastern gorilla (Gorilla beringei beringei) juvenile confiscated from poachers by national park authorities from poachers, awaiting release to the wild in wooden crate, Djomba, Virunga National Park,...

Jabruson / Hippopotamuses fighting (Hippopotamus amphibius) taken before major crash in numbers in the 1990s due to political instability and hunting. Rwindi sector of the Virunga National Park. Democratic Repub...

Jabruson / Young Chimpanzee in fruiting fig tree (Pan troglodytes schweinfurthii) Tongo, Virunga National Park, Kivu, Democratic Republic of Congo

Christophe Courteau,Christophe Courteau / Villagers walking along a road during a heavy rain shower, Virunga National Park, North Kivu Province, Democratic Republic of the Congo, August 2010.

Andy Rouse / Virunga Volcanoes National Park at dawn. Rwanda, Africa, April 2010.

Andy Rouse / View from the undergrowth looking up into the canopy of rainforest; prime Gorilla (Gorilla beringei) habitat of the Susa group on the upper slopes of Karisimbi Volcano. Virunga Volcanoes National Park...

Andy Rouse / Harvested potatoes in Virunga Volcanoes National Park with agricultural land behind and forest beyond where the mountain gorillas live, Rwanda, April 2010. Encroachment of the human population on habi...

Suzi Eszterhas / Mountain gorilla (Gorilla gorilla berengei) infant sitting on mothers head while she feeds on vegetation, Virunga Volcanoes National Park, Rwanda

Suzi Eszterhas / Female Mountain gorilla (Gorilla gorilla berengei) licking finger after cleaning herself, Virunga Volcanoes National Park, Rwanda

Suzi Eszterhas / Female Mountain gorilla (Gorilla gorilla berengei) picking nose, Virunga Volcanoes National Park, Rwanda

Andy Rouse / Parc National des Volcans / Volcanoes NP, Virunga Mountains, Rwanda, Africa, habitat of the Mountain gorillas

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) silverback moving through habitat, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) close up of eye, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei) blackback male in rainforest, in front of Sabinyo volcano, Volcanoes NP, Virunga mountains, Rwanda (non-ex)

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) silverback watching through forest, Virunga Mountains, Volcanoes NP, Rwanda (non-ex)

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) juvenile hanging from branch, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) silverback male scratching head, drunk on bamboo shoots, Volcanoes NP, Virunga mountains, Rwanda Note - if gorillas eat an excess of bamboo shoots they ca...

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) mother and baby with hairy head, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) close up of feet showing toe curled around branch, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) mother cradling and kissing foot of 1 week baby, Volcanoes NP, Virunga Mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) silverback male playing in habitat, drunk on bamboo shoots, Volcanoes NP, Virunga mountains, Rwanda Note - if gorillas eat an excess of bamboo shoots they...

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) silverback, face portrait, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) silverback portrait, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) baby with hairy head, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) mother with young and silverback male in background, Volcanoes NP, Virunga Mountains, Rwanda

Jabruson / Mountain gorilla silverback {Gorilla beringei} and human infant hands, Bukima, Virunga National Park, Democratic Republic of Congo, 1995 model released

Ingo Arndt / Mikeno Volcano (3634 meters) with lenticular cloud, Republic of the Congo in the Virunga heartland, view from Rwanda

Jabruson / Lava flow and corresponding fire moving through forest, Kimanura volcanic eruption, Virunga NP, Democratic Republic of Congo.

Jabruson / Hippopotamus {Hippopotamus amphibius} fighting, Rutchuru river, Virunga NP, Zaire.

Jabruson / Lava explodes from active volcano, Kimanura eruption, Virunga NP, Democratic Republic of Congo (formerly Zaire)

Karl Ammann / Hippopotamus and calf {Hippopotamus amphibius} Virunga NP, Democratic Republic of Congo.

Jabruson / Unusual horn formation in a Tutsi cow {Bos taurus} Virunga National Park, Zaire, Africa

Konrad Wothe / Mountain Gorilla (Gorilla gorilla beringei) males fighting, Virunga National Park, Democratic Republic of the Congo

Konrad Wothe / Mountain Gorilla (Gorilla gorilla beringei) baby rolling on forest floor, Virunga National Park, Congo

Jabruson / Mountain gorilla mother and baby {Gorilla beringei} Virunga NP, Dem Rep of Congo

Jabruson / Mountain gorilla silverback chewing plant stem (Gorilla gorilla beringei) Virunga NP, DR of Congo 'Rafiki'

Jabruson / Male Chimpanzee 'Opi' {Pan troglodytes} Tongo, Virunga NP, DR of Congo, Africa

Jabruson / Young Mountain gorilla {Gorilla beringei} peers into camera, Virunga NP, Dem Rep of Congo. Silverback "Rugabo" in background was killed by militia roaming the park during the Rwandan refugee crisis.

Jabruson / View from Stanley Glacier Virunga NP. Dem. Rep. of Congo, Africa

Jabruson / Lava flow destroying trees and vegetation. Kimanura volcano. Virunga NP, Democratic Republic of Congo.

Jabruson / Hippopotamus portrait head on, Virunga NP, DR Congo, Rutshuru river

Jabruson / Mountain gorilla portrait juvenile (Gorilla g. berengei). Virunga NP, Democratic Republic of Congo.

Jabruson / Mountain gorilla portrait, silverback (Gorilla g. beringei). Virunga NP, Republic Congo (formerly Zaire, Central Africa

Jabruson / Mountain gorilla portrait (Gorilla g. beringei) juvenile. Virunga NP, Democratic Republic of Congo.

Jabruson / Silverback mature male Mountain Gorilla, Virunga NP, DR Congo (formerly Zaire) resting midday siesta

Jabruson / Hippopotamus in Rutshuru River, Virunga NP, Democratic Republic of Congo.

Jabruson / Mountain gorilla silverback male, known as Salaama, resting. Democratic Republic of Congo Virunga National Park

Jabruson / Mountain gorilla silverback male 'Salaama' enjoying mid-day siesta, Virunga NP, DR Congo (formerely Zaire)

Jabruson / Kimanura eruption, Virunga NP, Democratic Republic of Congo.

Jabruson / Volcanic eruption , Kimanura volcano, Virunga NP, Democratic Republic of Congo.

Jabruson / Lava flow from the Kimanura volcano, Virunga NP, Democratic Republic of Congo.

Jabruson / Kimanura eruption. Virunga NP active volcanic region, Democratic Republic of Congo.

Jabruson / Kimanura eruption. Virunga NP active volcanic region, Democratic Republic of Congo.

Jabruson / Kimanura eruption. Virunga NP, Rep of Congo (formerly Zaire), Central Africa

Jabruson / Deforestation for fuel by Hutu refugees (900 tons wood per day). Virunga NP (Mikeno and Karisimbi volcanoes), Democratic Republic of Congo.

Jabruson / Mountain gorilla silverback male (Gorilla gorilla beringei) Zaire Virunga NP Rafiki

Jabruson / Mountain Gorilla eating thistles {Gorilla beringei} Virunga NP, Democratic Republic of Congo. Rafiki

Jabruson / Mountain gorilla young in tree {Gorilla beringei} Virunga NP, Dem Rep of Congo

Jabruson / Mountain gorilla baby {Gorilla beringei} Virunga NP, Dem Rep of Congo

Jabruson / Mountain gorilla mother and baby {Gorilla beringei} Virunga NP, Dem Rep of Congo

Jabruson / Giant groundsel {Senecio keniensis} with dead leaves protecting plant against cold at high altitudes, Mountains of the Moon, Virunga NP, Dem Rep of Congo

Jabruson / Full moon and stars over Mount Stanley, Mountains of the Moon, Ruwenzori mtns, Virunga NP, Dem Rep of Congo

Jabruson / Mountain gorilla baby {Gorilla beringei} Virunga NP, Dem Rep of Congo

Jabruson / Mountain gorilla family, mother suckling young + male silverback in background {Gorilla g beringei} Virunga NP, Dem Rep Congo

Jabruson / Young Chimpanzee playing with park warden {Pan troglodytes schweinfurthii} Virunga NP, Dem Rep of Congo

Jabruson / Close up of African elephant tusk and trunk in water {Loxodonta africana} Virunga NP, Democratic Republic of Congo.

Jabruson / Male Chimpanzee (Opi) {Pan troglodytes schweinfurthii} Virunga NP, Democratic Republic of Congo.

Jabruson / Mountain gorilla 'Rafiki' {Gorilla gorilla beringei} male silverback Virunga NP Dem Rep Congo, Africa

Jabruson / Lava flow from the Kimanura volcano, Virunga NP, Democratic Republic of Congo.

Pedro Narra / Mountain Gorilla (Goriila beringei) infant with wet fur, Volcanoes National Park, Virunga Mountains, Rwanda.

Pedro Narra / Mountain Gorilla (Goriila beringei) portrait, , Volcanoes National Park, Virunga Mountains, Rwanda.

Pedro Narra / Mountain Gorilla (Goriila beringei) family group resting, Volcanoes National Park, Virunga Mountains, Rwanda.

Pedro Narra / Mountain Gorilla (Goriila beringei) baby riding on mothers back, Volcanoes National Park, Virunga Mountains, Rwanda.

Pedro Narra / Mountain Gorilla (Goriila beringei) close up of eyes, Volcanoes National Park, Virunga Mountains, Rwanda.

Pedro Narra / Mountain Gorilla (Goriila beringei) portrait, Volcanoes National Park, Virunga Mountains, Rwanda.

Paul Bertner / Moth (Erebidae) camouflaged on bark, Virunga National Park, Democratic Republic of the Congo

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) silverback male pushing a guard from the ICCN (Congolese Institute for the Conservation of Nature) away, member of the Humba group, Virunga National Park,...

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) silverback male, portrait, member of the Munyaga group, Virunga National Park, North Kivu, Democratic Republic of Congo, Africa, Critically endangered.

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) silverback male, portrait, member of the Munyaga group, Virunga National Park, North Kivu, Democratic Republic of Congo, Africa, Critically endangered.