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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.