- London Zoo "is the world's oldest scientific zoo. It was opened in London on 27 April 1828...
Today it houses a collection of 755 species of animals, with 16,802 individuals, making it one of the largest collections in the United Kingdom.
The zoo is sometimes called Regent's Zoo."
- Scales, tails & wings, oh my! The London Zoo counts its animals - 3 January 2013
"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."