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Last Updated: Friday January 07 2011 09:13 GMT

Ricky finds out how you count fish at London Zoo!

When Ricky heard that London Zoo was doing its annual animal count, he just had to get involved!

At the beginning of each year, the zoo keepers count all their residents so they know how many they've got and who they've got.

Big animals such as camels and monkeys are fairly easy to keep track of, but what about smaller ones, like fish?!

We sent to Ricky to find out how the zoo staff do it and have a go himself. But was he any good...? Watch the clip to find out!