London Zoo is the world's oldest scientific zoo. It was opened in London on 27 April 1828, and was originally intended to be used as a collection for scientific study. In 1832 the animals of the Tower of London menagerie were transferred to the zoo's collection. It was eventually opened to the public in 1847. Today it houses a collection of 698 species of animals, with 20,166 individuals, making it one of the largest collections in the United Kingdom. The zoo is sometimes called Regent's Zoo.