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Last Updated: Tuesday January 05 2010 17:26 GMT

Hayley counts animals at the zoo!

Hayley holding a stick insect

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Every year zoos count up how many animals they have living there, and on Tuesday Hayley went along to London Zoo to help them out!

It's called a stock take and it's the same as a shop counting jumpers or books, except zoo keepers need to know how many animals they have.

Fish, insects and bugs are some of the hardest to count because they're really small, and they move around a lot.

At London Zoo they have to record the numbers of more than 750 different species including gorillas, squirrel monkeys and tigers.

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