Humboldt Penguins swim in their pool as a keeper looks on through a spherical window during the annual stocktake press preview at London Zoo in Regents Park in London Monday, January 4, 2016. A requirement of ZSL London Zoo's license, the annual audit takes keepers a week to complete and all of the information is shared with zoos around the world via the International Species Information System, where it's used to manage the worldwide breeding programmes for endangered animals. (Photo by Alastair Grant/AP Photo)





A ring-tailed lemur looks round during the annual stocktake press preview at London Zoo in Regents Park in London Monday, January 4, 2016. (Photo by Alastair Grant/AP Photo)





The compulsory count is required as part of ZSL London Zoo's zoo license and the results are logged into the International Species Information System (ISIS), where the data is shared with zoos around the world and used to manage the international breeding programmes for endangered animals. (Photo by James Warren/UPPA via ZUMA Press)





Keeper Jamie Mitchell poses with a Mexican Red-Kneed Tarantula during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Zookeeper Jamie Mitchell poses for a photograph with a Mexican red-kneed tarantula during the annual stocktake of animals at ZSL London Zoo on January 4, 2016 in London, England. The zoo's annual stocktake requires keepers to check on the numbers of every one of the 800 different animal species, including every invertebrate, bird, fish, mammal, reptile, and amphibian. (Photo by Carl Court/Getty Images)





Keeper Veronica Heldt moves her counting clip board as Meerkats look for food around her during the annual stocktake press preview at London Zoo in Regents Park in London Monday, January 4, 2016. (Photo by Alastair Grant/AP Photo)





Keeper Veronica Heldt poses with a Meerkat during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Keeper Collette Gibbings look at a tank full of Moon Jellyfish during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Keeper Luke Harding poses with a Jackson's chameleon during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Keeper Luke Harding poses with a Jackson's chameleon during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Keeper Luke Harding poses with a Jackson's chameleon during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





A Jackson's chameleon is handled by a zoo keeper during the annual stocktake of animals at ZSL London Zoo on January 4, 2016 in London, England. The zoo's annual stocktake requires keepers to check on the numbers of every one of the 800 different animal species, including every invertebrate, bird, fish, mammal, reptile, and amphibian. (Photo by Carl Court/Getty Images)





Rikki the sole Rockhopper penguin gets his fish as Humboldt penguins queue behind him during the annual stocktake press preview at London Zoo in Regents Park in London Monday, January 4, 2016. (Photo by Alastair Grant/AP Photo)





Humboldt penguins swim in their pool during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Humboldt penguins swim in their pool during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Humboldt Penguins swim in their pool during the annual stocktake press preview at London Zoo in Regents Park in London Monday, January 4, 2016. A requirement of ZSL London Zoo's license, the annual audit takes keepers a week to complete and all of the information is shared with zoos around the world via the International Species Information System, where it's used to manage the worldwide breeding programs for endangered animals. (Photo by Alastair Grant/AP Photo)





Humboldt penguins swim in their pool during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Humboldt penguins swim in their pool during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Keeper Janet Abreu counts Humboldt penguins during a photocall at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Keeper Jessica Jones poses with a Llama during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





A llama looks at a photographers lens during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)





Jessica Jones handles a clipboard as she poses for a photograph with a llama during the annual stocktake of animals at ZSL London Zoo on January 4, 2016 in London, England. (Photo by Carl Court/Getty Images)





Children look at Humboldt penguins swim in their pool during the stock take at London Zoo in London, Britain January 4, 2016. (Photo by Stefan Wermuth/Reuters)