London Zoo face mammoth task of annual audit
22 August 2012 Last updated at 12:28 BST
Zoo keepers at London Zoo face the daunting task of measuring and weighing all the animals for their annual audit.
The zoo is home to about 750 different species - with thousands of animals needing measuring and weighing.
The BBC's Carol Kirkwood met Pickles the penguin at the zoo, along with head bird keeper Adrian Walls.