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

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

Steve O. Taylor (GHF) / Juvenile Eastern Lowland gorilla (Gorilla beringei graueri) beating its chest, leaning against a tree and sitting down, Kahuzi-Biega National Park, Democratic Republic of the Congo, 2009.

Christophe Courteau / Mountain gorilla (Gorilla gorilla beringei) blackback Shirimpumu displaying, non dominant male, Sabyinyo Group, Volcanoes National Park, Virunga Mountains, Rwanda

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) age one and a half years playing (beating chest). Parc National des Volcans, Rwanda. Endangered species

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

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

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) young gorilla beating its chest in habitat, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) young gorilla beating its chest, Volcanoes NP, Virunga mountains, Rwanda