A black-capped squirrel monkey sits on an abacus during the stock take at London Zoo in London
A black-capped squirrel monkey sits on an abacus during the stock take at London Zoo in London, January 5, 2015. The animal count, a requirement of London Zoo's license, included additions to the international conservation breeding programme such as the three tiger cubs and Philippine crocodiles. REUTERS/Toby Melville (BRITAIN - Tags: ANIMALS)