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.