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London Zoo residents weigh in for annual audit

22 August 2012 Last updated at 14:16 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.

It's a job that requires big scales, quite a long measuring tape, and a lot of nerve.

Siobhan Robbins reports.

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