Silverback mountain gorilla sleeping {Gorilla beringei} Virunga NP, Congo, BDA,CENTRAL AFRICA,PORTRAITS,BRUCE,MAMMALS,RESTING,VERTICAL,CONGO,FACES,PRIMATES,SILVERBACK,MALES,APES,RESERVE,AFRICA,DAVIDSON,SLEEPING,TROPICAL RAINFOREST,RAFIKI,VIRUNGA,GREAT APES , Bruce Davidson, Jabruson