London Zoo staffer counts penguins

Photo: Oli Scarff/Getty Images

Annual animal count

A keeper records the number of penguins living inside England's famous London Zoo on Jan. 2 during the annual stocktake of animals.

The annual headcount requires keepers to document every single invertebrate, bird, fish, mammal, reptile and amphibian — a whopping 850 different species in all — living within the zoo's walls.

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Western lowland gorillas are counted at the London Zoo

Photo: Oli Scarff/Getty Images

Kumbuka, a Western Lowland gorilla, stands next to a chalkboard documenting the number of individuals living in his enclosure at the London Zoo.

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London Zoo staffer counts a jungle nymph

Photo: Oli Scarff/Getty Images

A keeper records a jungle nymph stick insect during the zoo's annual stocktake of animals.

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London Zoo staffer counts meerkats

Photo: Oli Scarff/Getty Images

Meerkats gather around a keeper as she performs a headcount in their enclosure at the London Zoo.

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Catie Leary is a photo editor at Mother Nature Network. Follow her on Twitter and Google+.
 

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The annual headcount requires keepers to document every single invertebrate, bird, fish, mammal, reptile and amphibian living within the zoo's walls.