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By PhotoBlog
A muddy bullfrog is inspected during a photo call for the annual census at the London Zoo on Jan. 3, 2013.Kirsty Wigglesworth / AP

More than 17,500 animals, including birds, fish, mammals, reptiles and amphibians are counted in the annual census at the London Zoo. The count is a compulsory part of the zoo's license and the information is used for managing international breeding programs of endangered animals. 

Previously on PhotoBlog: 

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