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So how do you count more than 19,000 animals, large and small, for London Zoo's annual stock take?
Martin Stew went to find out.
London Zoo are counting all their animals today from the huge gorillas to the tiny ants.
Mark Habben, manager of the Regents Park zoo, explains why they do an annual stocktake.
Latest ITV News reports
All the animals are being counted at London Zoo today from the tiny leafcutter ants to the huge silverback gorillas.