Lions enjoy 'Christmas pudding', a giant ball scented with classic yuletide spices, 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)