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