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Every year, the London Zoo counts all its animals.
It's called a stocktake.
The world famous zoo has a total of 14,000 animals, but more arrive each year.
London Zoo's animal population's growing.
Manager Dan Simmonds talks about the new animals.
It's very important to complete the count of all the animals.
The zookeepers need to count big mammals like gorillas, small amphibians like frogs and fish which move around a lot.
The zookeepers have to use creative methods to count some animals.
They count each fish by taking photos of them, and they count each ant colony, not each ant.
With other animals like the squirrel monkeys and penguins, they try to use training and prizes to count them.
Stocktaking's important for working with other zoos as Dan Simmonds explains.
The stocktake helps keepers get to know the new animals and to record any new animal births.
That way, London Zoo can plan extra living space for them.