'Animal Adventures this Christmas' photocall held at ZSL London Zoo

A gorilla enjoys the treats in a giant advent calendar during an 'Animal Adventures this Christmas' photocall at Zoological Society of London (ZSL) London Zoo, in London, Britain, on Dec. 20, 2018. Zookeepers of the ZSL London Zoo prepared some seasonal surprises for the Zoo's residents to enjoy on Thursday. (Xinhua/Isabel Infantes)