Andy Rouse / Mountain gorilla (Gorilla beringei) silverback in Susa group, Parc National des Volcans, Rwanda

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

John Sparks / David Attenborough with mountain gorillas, on location during filming for BBC 'Life on Earth' series in Rwanda 1978

Mary McDonald / Adult Mountain gorilla (Gorilla beringei beringei) holding baby, Hirwa group, Volcanoes National Park, Rwanda

Eric Baccega / Mountain gorilla (Gorilla beringei) juvenile aged 2 years, hanging from branch, member of the Nyakagezi group, Mgahinga National Park, Uganda. January.

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

Christophe Courteau / Mountain gorilla (Gorilla beringei beringei), silverback and juvenile son. Volcanoes National Park. Rwanda.

Christophe Courteau / Mountain gorilla (Gorilla beringei beringei), dominant silverback in forest clearing. Volcanoes National Park, Rwanda.

Christophe Courteau / Mountain gorilla (Gorilla beringei beringei) blackback, juvenile male demonstrating power. Volcanoes National Park, Rwanda.

Christophe Courteau / Mountain gorilla (Gorilla beringei beringei) blackback, juvenile male demonstrating power. Volcanoes National Park, Rwanda.

Christophe Courteau / Mountain gorilla (Gorilla beringei beringei) silverback sitting on boundary wall between Volcanoes National Park and a Potato crop, looking into valley. Area to be restored to forest. Rwanda.

Christophe Courteau / Mountain gorilla (Gorilla beringei beringei) female with baby, portrait. Volcanoes National Park, Rwanda.

Mary McDonald / Mountain gorilla (Gorilla beringei beringei) female with baby age, 4 months, Volcanoes National Park, 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,...

Christophe Courteau / Female Mountain gorilla (Gorilla beringei beringei) playing with baby, Volcanoes National Park, Rwanda.

Christophe Courteau / Mountain gorilla (Gorilla gorilla beringei) playing, rolling down a slope, part of the Amahoro Gorilla Group, Volcanoes National Park, Rwanda.

Christophe Courteau / Mountain gorilla (Gorilla gorilla beringei) feeding, part of the Agashya Gorilla Group, Volcanoes National Park, Rwanda.

Christophe Courteau / Family of Mountain gorillas (Gorilla gorilla beringei) with a silverback, grooming and looking around, part of the HIrwa Gorilla Group, Volcanoes National Park, Rwanda.

Ingo Arndt / Rainforest slope Mount Bisoke (3711m), Mountain gorilla habitat (Gorilla gorilla beringei), Parc National des Volcans, Rwanda

Ingo Arndt / Mountain gorilla portrait (Gorilla gorilla berengeii) Parc des Volcans, Rwanda

Ingo Arndt / Mountain gorilla (Gorilla gorilla berengei) yawning, showing stained teeth, Parc des Volcans, Rwanda

Ingo Arndt / Mountain gorilla male portrait {Gorilla beringei} Mgahinga NP, Uganda

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.

Theo Allofs / Mountain Gorilla (Gorilla gorilla beringei) juvenile male, Volcanoes National Park, Rwanda

Theo Allofs / Mountain Gorilla (Gorilla gorilla beringei) juvenile male, Volcanoes National Park, Rwanda

Sean Crane / Mountain Gorilla (Gorilla gorilla beringei) mother and young, Bwindi Impenetrable National Park, Uganda

Ole Jorgen Liodden / Mountain gorilla (Gorilla beringei beringei) baby chewing on stick, Virunga, Rwanda.

Andy Rouse / Mountain gorilla (Gorilla beringei) silverback yawning with mouth wide open. Rwanda.

Andy Rouse / Mountain gorilla (Gorilla beringei) female portrait, Rwanda.

Andy Rouse / Mountain gorilla (Gorilla beringei) baby held by mother, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) mother with young, and silverback in background. Virunga Mountains, Rwanda. Non-ex.

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) portrait of blackback male, Virunga Mountains, Rwanda

Adri de Visser / Mountain Gorilla (Gorilla gorilla beringei) in rain, Bwindi Impenetrable National Park, Uganda

Andy Rouse / Mountain Gorilla (Gorilla beringei beringei) mother and baby Rwanda, Africa.

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) mother lying on back and holding baby age one year. Parc National des Volcans, Rwanda. Endangered species

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,...

Cyril Ruoso / Mountain Gorilla (Gorilla gorilla beringei) large silverback continuing to display after attacking a tourist, Virunga Mountains, Rwanda

Cyril Ruoso / Mountain Gorilla (Gorilla gorilla beringei) female with her three month old newborn, Parc National Des Volcans, Rwanda

Cyril Ruoso / Mountain Gorilla (Gorilla gorilla beringei) close-up portrait of a silverback in the rain, Parc National Des Volcans, Rwanda

Martin Willis / Mountain Gorilla (Gorilla gorilla beringei) male feeding, Volcanoes National Park, Rwanda

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) silverback feeding, Parc National des Volcans, Rwanda

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) mother holding five month old twin babies, Parc National des Volcans, Rwanda

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) mother holding five month old twin babies, Parc National des Volcans, Rwanda

Christophe Courteau / Mountain Gorilla (Gorilla beringei) female holding baby in dense vegetation in Volcanoes National Park, Rwanda, at an altitude of 3000m, short dry season, February

Christophe Courteau / Mountain gorilla (Gorilla beringei) baby in mother's arms. 3000 metres above sea level in Volcanoes National Park, Rwanda. Short dry season, February

Christophe Courteau / Mountain Gorilla (Gorilla beringei) dominant male silver back sitting amongst vegetation. 2700 metres above sea level in Volcanoes National Park, Rwanda. short dry season, February

Paul D Stewart / 1853 illustration of Gorilla, contemporary coloured copperplate engraving from 'Das Buch der Welt' John Weik, Stuttgart. The lowland Gorilla was first accurately described outside Africa by the missio...

Cheryl-Samantha Owen / Mountain gorilla portrait (Gorilla gorilla), Bwindi Impenetrable Forest, Uganda, East Africa

Cheryl-Samantha Owen / Mountain gorilla (Gorilla beringei) resting on back yawning, Bwindi Impenetrable Forest, Uganda, East Africa

Andy Rouse / Mountain gorilla (Gorilla beringei) silverback walking in front of watching tourists, Virunga Volcanoes, Rwanda 2012. No release available.

Christophe Courteau / Silverback Mountain gorilla (Gorilla beringei) in the bamboo forest, this is Munyinya the leader of Hirwa group, Sabyinyo volcano, Volcano National Park, Rwanda

Christophe Courteau / Mountain gorillas (Gorilla beringei) Hirwa group led by the silverback dominant male Munyinya, Volcanoes National Park, Rwanda, elevation 2610 m

Christophe Courteau / Mountain gorilla silverback, male called Munyinya, (Gorilla beringei) with tourist taking photo, part of Hirwa Group, Volcanoes National Park, Rwanda

Ole Jorgen Liodden / Young Mountain Gorilla (Gorilla beringei beringei) portrait, looking thoughtful. Parc des Volcans National Park, Rwanda, December.

Christophe Courteau / Eastern lowland gorilla (Gorilla beringei graueri) hand and foot of young gorilla, Kahuzi Biega NP, Democratic Republic of Congo.

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 / Two male Mountain Gorilla (Gorilla beringei) facing up and chest-beating in a dominance / hierarchy behaviour. Rwanda, Africa

Andy Rouse / Two Mountain Gorilla (Gorilla beringei) in habitat. Rwanda, Africa

Andy Rouse / Portrait of a Mountain Gorilla (Gorilla beringei) with mouth wide open. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) adult playing with an infant. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) family sitting in groupm male looking to camera. Rwanda, Africa

Andy Rouse / A silverback dominant male Mountain Gorilla (Gorilla beringei) tussling with a subordinate in habitat. Rwanda, Africa

Andy Rouse / Young Mountain Gorilla (Gorilla beringei) climbing a vine. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) male and female after mating. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) adult holding infant close to her. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) in habitat seen through leaves. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) young infant resting on an adult's back. Rwanda, Africa

Andy Rouse / Portrait of a Mountain Gorilla (Gorilla beringei) with a view over forest canopy. Rwanda, Africa, March.

Andy Rouse / Portrait of a Mountain Gorilla (Gorilla beringei) infant. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) juvenile in wet misty forest habitat. Rwanda, Africa, March.

Andy Rouse / Portrait of a Mountain Gorilla infant (Gorilla beringei). Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) adult sleeping with infant. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) infant peering through vegetation. Rwanda, Africa

Andy Rouse / Mountain Gorilla (Gorilla beringei) infant riding on its mother's back. Rwanda, Africa

Andy Rouse / Mountain gorilla (Gorilla beringei) silverback beating chest and charging, Susa group, Parc National des Volcans, Rwanda Not available for ringtone/wallpaper use.

Andy Rouse / Mountain gorilla (Gorilla beringei) silverback, Susa group, Parc National des Volcans, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei) silverback charging forward, Susa group, Parc National des Volcans, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei) silverback beating chest and charging forward, Susa group, Parc National des Volcans, Rwanda, HIGHLY COMMENDED, MAMMAL BEHAVIOUR, 2011 WILDLIFE PHOTOGRAPHER OF THE...

Andy Rouse / Mountain gorilla (Gorilla beringei) silverback beating chest and charging, Susa group, Parc National des Volcans, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei) youngster with bad teeth in Susa group, Parc National des Volcans, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei) baby in mother's arms, Susa group, Parc National des Volcans, Rwanda

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

Eric Baccega / Young Mountain gorilla standing up in the rain (Gorilla beringei beringei) Volcanoes National Park, Rwanda, Africa, March 2009

Eric Baccega / Silverback male Eastern lowland gorilla (Gorilla beringei graueri) intimidation display by chest beating, equatorial forest of Kahuzi Biega Park, Democratic Republic of Congo, Africa, March 2009

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)