Jae Jae, a Sumatran tiger, is measured during the London Zoos annual weigh-in
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London Zoo residents weigh in for annual audit

21 August 2013 Last updated at 13:21 BST

Zoo keepers begin the long process of measuring and weighing every animal at London Zoo for their annual audit.

The zoo is home to more than 19,000 animals, and it is a task that requires big scales, a long measuring tape, and a lot of patience.

Jon Brain reports.