A shy silverback mountain gorilla crawls backwards into dense vegetation in the Virunga National Park, Democratic Republic of Congo.

A silverback mountain gorilla looks around the surrounding dense vegetation in the Virunga National Park, Democratic Republic of Congo.

A Woolly monkey hides behind a thick branch, looking around suspiciously. It then moves onto a nearby branch, with its baby hanging from its back.

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A silverback mountain gorilla hides behind a thick layer of plants in the Virunga National Park, Democratic Republic of Congo.

Close up of Mountain Gorilla's face, then two Mountain Gorillas hiding heads behind vegetation in a rainforest in Uganda, one is looking at camera.

A Woolly monkey sits on thick branch, looking down, then crawls along the branch.

A silverback mountain gorilla in the Virunga National Park, Democratic Republic of Congo, picks at leaves and vines and chews them while lying down.

A silverback mountain gorilla in the Virunga National Park, Democratic Republic of Congo, sits in dense vegetation, scratching its face. It then gets up and wanders off.

A silverback mountain gorilla in the Virunga National Park, Democratic Republic of Congo, looks curiously into the camera then hides behind the dense vegetation surrounding it.

A Woolly monkey climbs onto a thick branch. Its baby is clinging onto it. The monkey moves along the branch.

A Woolly monkey scratches its leg. When it turns around, its baby is seen clinging onto its back. The monkey then crawls away with its baby attached to its back.

A silverback mountain gorilla hides behind a thick layer of plants and picks at leaves in the Virunga National Park, Democratic Republic of Congo.

Close up of small child's hand held up during lesson in school classroom, against blurred background

A Woolly monkey crawls along a branch. Its baby is clinging onto its side. The monkey sits down on the branch for a moment, then gets up to continue moving along the branch.

A silverback mountain gorilla lying in dense vegetation in the Virunga National Park, Democratic Republic of Congo.

A baby Woolly monkey clings onto the back of its mother.

Two silverback mountain gorillas are initially in shot. The gorilla in the foreground sits in dense vegetation in the Virunga National Park, Democratic Republic of Congo, picking at leaves. It then wanders off to hide behind a thick layer of plants.