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A zoo keeper holds a Bull frog during the annual stocktake at ZSL London Zoo in central London on January 3, 2013. ZSL London Zoo embarked on January 3 on their annual complete head-count of every animal at the zoo, which houses over 17,000 animals. BEN STANSALL/AFP/Getty Images

A Bull Frog is held during London Zoo's annual stocktake of animals on January 3, 2013 in London, England. The zoo's stocktake takes place annually, and gives keepers a chance to check on the numbers of every one of the animals from stick insects and frogs to tigers and camels. (Photo by Dan Kitwood/Getty Images)

A zoo keeper poses with a European Eagle Owl during the annual stocktake at ZSL London Zoo in central London on January 3, 2013. ZSL London Zoo embarked on January 3 on their annual complete head-count of every animal at the zoo, which houses over 17,000 animals. BEN STANSALL/AFP/Getty Images

A picture shows a European Eagle owl during the annual stocktake at ZSL London Zoo in central London on January 3, 2013. ZSL London Zoo embarked on January 3 on their annual complete head-count of every animal at the zoo, which houses over 17,000 animals. BEN STANSALL/AFP/Getty Images

Keeper Jeff Lambert smiles as two leaf insects get close during a photo call for the annual stock take at London Zoo, Thursday, Jan. 3, 2013. More than 17,500 animals including birds, fish, mammals, reptiles and amphibians are counted in the annual stock take at the zoo. (AP Photo/Kirsty Wigglesworth)

A male jungle nymph sits on a female jungle nymph during a photo call for the annual stock take at London Zoo, Thursday, Jan. 3, 2013. More than 17,500 animals including birds, fish, mammals, reptiles and amphibians are counted in the annual stock take at the zoo. (AP Photo/Kirsty Wigglesworth)

Keeper Jeff Lambert smiles as two leaf insects get close during a photo call for the annual stock take at London Zoo, Thursday, Jan. 3, 2013. More than 17,500 animals including birds, fish, mammals, reptiles and amphibians are counted in the annual stock take at the zoo. (AP Photo/Kirsty Wigglesworth)

A Spectacled Owl nips a clipboard during a photo call for the annual stock take at London Zoo, Thursday, Jan. 3, 2013. More than 17,500 animals including birds, fish, mammals, reptiles and amphibians are counted in the annual stock take at the zoo. (AP Photo/Kirsty Wigglesworth)

Zoo keeper Zuzana Matyasova poses with penguins during the annual stock take at London Zoo January 3, 2013. The compulsory count of more than 17,500 animals is noted annually as part of the zoo's licence, and the information is logged with the International Species Information System (ISIS), used for managing international breeding programs of endangered animals. REUTERS/Luke MacGregor

Penguins swim during the annual stocktake at ZSL London Zoo in central London on January 3, 2013. ZSL London Zoo embarked on January 3 on their annual complete head-count of every animal at the zoo, which houses over 17,000 animals. BEN STANSALL/AFP/Getty Images

A zoo keeper poses counting penguins during the annual stocktake at ZSL London Zoo in central London on January 3, 2013. ZSL London Zoo embarked on January 3 on their annual complete head-count of every animal at the zoo, which houses over 17,000 animals. BEN STANSALL/AFP/Getty Images

Penguins swim during the annual stocktake at ZSL London Zoo in central London on January 3, 2013. ZSL London Zoo embarked on January 3 on their annual complete head-count of every animal at the zoo, which houses over 17,000 animals. BEN STANSALL/AFP/Getty Images

A photographer takes pictures of penguins during the annual stocktake at ZSL London Zoo in central London on January 3, 2013. ZSL London Zoo embarked on January 3 on their annual complete head-count of every animal at the zoo, which houses over 17,000 animals. BEN STANSALL/AFP/Getty Images

Kepper Amy Callaghan takes a close look at Jill the Red Kneed Spider during the annual stocktake at London Zoo, Thursday, Jan. 3, 2013. More than 17,500 animals including birds, fish, mammals, reptiles and amphibians are counted in the annual stocktake at the zoo. (AP Photo/Kirsty Wigglesworth)

A Diamond Python is held during London Zoo's annual stocktake of animals on January 3, 2013 in London, England. The zoo's stocktake takes place annually, and gives keepers a chance to check on the numbers of every one of the animals from stick insects and frogs to tigers and camels. (Photo by Dan Kitwood/Getty Images)

Zoo keeper Grant Kother poses with a Diamond Python during the annual stock take at London Zoo January 3, 2013. The compulsory count of more than 17,500 animals is noted annually as part of the zoo's licence, and the information is logged with the International Species Information System (ISIS), used for managing international breeding programs of endangered animals. REUTERS/Luke MacGregor

Zoo keeper Kate Sanders poses with a Squirrel Monkey during the annual stock take at London Zoo January 3, 2013. The compulsory count of more than 17,500 animals is noted annually as part of the zoo's licence, and the information is logged with the International Species Information System (ISIS), used for managing international breeding programs of endangered animals. REUTERS/Luke MacGregor

A meerkat stands on keeper Tegan McPhail's clipboard during a photo call for the annual stock take at London Zoo, Thursday, Jan. 3, 2013. More than 17,500 animals including birds, fish, mammals, reptiles and amphibians are counted in the annual stock take at the zoo. (AP Photo/Kirsty Wigglesworth)

A zoo keeper poses with meerkats during the annual stocktake at ZSL London Zoo in central London on January 3, 2013. ZSL London Zoo embarked on January 3 on their annual complete head-count of every animal at the zoo, which houses over 17,000 animals. BEN STANSALL/AFP/Getty Images

Zoo keeper Tegan McPhail posers with meerkats during the annual stock take at London Zoo January 3, 2013. The compulsory count of more than 17,500 animals is noted annually as part of the zoo's licence, and the information is logged with the International Species Information System (ISIS), used for managing international breeding programs of endangered animals. REUTERS/Luke MacGregor

Keeper Pippa Green helps count some of the penguins as part of the annual stock take at Bristol Zoo on January 2, 2013 in Bristol, England. The annual animal 'census' is carried out at the start of each year and includes stocktaking more than 400 species; from tiny insects, fish and birds, to seals, gorillas and monkeys. (Photo by Matt Cardy/Getty Images)

Keeper Sarah Hall helps count some of the meerkats as part of the annual stock take at Bristol Zoo on January 2, 2013 in Bristol, England. The annual animal 'census' is carried out at the start of each year and includes stocktaking more than 400 species; from tiny insects, fish and birds, to seals, gorillas and monkeys. (Photo by Matt Cardy/Getty Images)

A meerkat watches as Sarah Hall (not pictured) counts them as part of the annual stock take at Bristol Zoo on January 2, 2013 in Bristol, England. The annual animal 'census' is carried out at the start of each year and includes stocktaking more than 400 species; from tiny insects, fish and birds, to seals, gorillas and monkeys. (Photo by Matt Cardy/Getty Images)

Keeper Sarah Hall helps count some of the meerkats as part of the annual stock take at Bristol Zoo on January 2, 2013 in Bristol, England. The annual animal 'census' is carried out at the start of each year and includes stocktaking more than 400 species; from tiny insects, fish and birds, to seals, gorillas and monkeys. (Photo by Matt Cardy/Getty Images)