In central Africa, the gorillas’ natural habitat is no longer a safe haven as deforestation, poaching and human diseases take their toll.
The Aspinall Foundation is working to rehabilitate baby and adult gorillas and reintroduce them to the jungles of Congo-Brazzaville.
Mountain gorillas have moderately long coats, are black and tinged at the back with silver, whereas western lowland gorillas (above) are natural redheads, with slightly pointed skulls covering short orange fur.
The foundation originally kept gorillas rescued from traders in an orphanage, but was granted a natural reserve by the Congolese government.
The baby gorillas are attended to by nursemaids, who bottle feed them and attempt to teach them to climb, play and forage for food.
Oudiki was born at Howletts Wild Animal Park, owned by John Aspinall, and released into the reserve in Gabon, one of three reserves used by the foundation, in 2008.
The young gorillas sleep out at night and play further afield as they get older.
Eventually they are released as a group – to keep their social structure – on to a large island, or piece of land with rivers and swamps as boundaries.
So far, the foundation has successfully reintroduced two groups back into the wild, including Tchivou and baby Elikia (left) with Koto and baby Elonga (right).
And one day, hopefully, they will mate, have babies, and repopulate the area – as four re-released females have done.
Teke, here with Djembo, is the first ever baby born to reintroduced gorillas at the reserve in April 2004.
Congo's orphan gorillas - Telegraph