Adrian Walls, Team Leader of Birds poses in the Penguin Beach area as he participates in the annual stock take at London Zoo in central London January 4, 2012. The annual number count of over 16 000 mammals, birds, fish, reptiles, invertebrates and amphibians is a compulsory part of the zoo license renewal. REUTERS/Toby Melville (BRITAIN - Tags: ANIMALS SOCIETY ANNIVERSARY)