BRIEF HISTORY DURING THE SNOW ERA (1813-58)
The origin and conclusion of zoos in London started with the Edward Cross's Menagerie (1773-1829), proceeded to the Surrey Zoological Gardens (1831-1877), and culminated with the Zoological Gardens in Regent's Park (1828-present).
Zoological Gardens
The Zoological Society of London was founded in April 1826
by Sir Thomas Stamford Raffles (see picture) and
other like-minded individuals.
Raffles was also the first President but died shortly after assuming his post in July 1826,
one day
before his 45th birthday; the organization lived on.
The purpose of the society was research, studying animals in the comparative
freedom of a leased site in Regent's Park. They intended to have a
collection of living animals, a museum with prepared specimens, and a library.
The zoo was meant primarily for scientists and the public was admitted by
entrance fee as a
means to finance their research. 
Two years following the founding, the group in 1828 opened the zoological gardens (or zoo) on the north side of Regent's Park. In the ensuing years, the London zoo acquired the world's largest animal collection, including in 1851 a four-ton hippopotamus named Obaysch (see 1853 map below). The first elephant was acquired in 1831, followed by an Indian rhinoceros in 1834 and the first giraffes in 1836. The world's first reptile house was opened in 1849, followed in 1853 by the world's first public aquarium. Most of the early buildings and much of the detailed development was done by Decimus Burton. The earliest of Burton's structures in the zoo were small, set in an elegant garden. Included were aviaries to display exotic birds and a bear enclosure where the animals could be fed with a bun on a stick (see pictures below in 1830 and 1840s). The illustrations of the camel house and carnivora presented below also show more of the times and location.
An early photographer of the zoo was the Count of Montizon (Don Juan de Bourbon y Braganza), a grandson of King Carlos IV of Spain. Starting in the summer of 1852, he took photos in the zoo both to record the animals and to demonstrate his skills with the new technology. Some of his earliest photos are included with the detailed 1853 map (see below).
Sources:
Edwards J. London Zoo from Old Photographs, 1852-1914, 1996.
Encylopaedia Britannica (internet), 2000.
Porter R. London: A Social History, 1994.
Richardson J. The Annals of London, 2000.
Weinreb B, Hibbert C (eds). The London Encyclopaedia, 1993.
Zuckerman L (ed). Symposia of the Zoological Society of London 40, 1976.
Picture of Aviary in 1830
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Aviary for Small Birds in 1830
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Picture of Bear Pit in 1830
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Picture of Camel House in 1835
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Picture of Aviary in 1835
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Site in Crutchley's London Map of 1846
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Detailed Map of Zoo in 1853 and Some Animals
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