Animalia,Animal,Wildlife,Vertebrate,Mammalia,Mammal,Primate,Primates,Hominidae,Ape,Great ape,Hominoidea,Gorilla,Gorilla beringei,Mountain Gorilla,Eastern Gorilla,Gorilla gorilla beringei,Leaning,Lean,Sitting,Africa,Central Africa,Democratic Republic of the Congo,Moving Image,Footage,Young Animal,Tropical,Mountain,Woodland,Animal Behaviour,Aggression,Reserve,Forest,Protected area,National Park,Eastern Lowland Gorilla,Grauer's Gorilla,HD,High definition,DRC,Chest beating,Chest pounding,Chest thumping