Ambam the Western lowland gorilla celebrated his 21st birthday in the UK. Keepers marked the occasion by giving Ambam and his group some special presents filled with food. Ambam became a YouTube sensation at the end of January with his habit of walking upright. Ambam has now been watched online over 5 million times, thrusting him into global superstardom. Ambam is pictured at Howletts Wild Animal Park, UK.