A zoo (short for zoological garden; also called a zoological park, animal park, or menagerie) is a facility where animals are kept within enclosures for exhibition and often bred for Conservation biology, conservation purposes. The term ''zoological garden'' refers to zoology, the study of animals. The term is derived from the Ancient Greek , , 'animal', and the suffix , , 'study of'. The abbreviation ''zoo'' was first used of the London Zoological Gardens, which was opened for scientific study in 1828, and to the public in 1847."Landmarks in ZSL History"
The first modern zoo was the Tierpark Hagenbeck by Carl Hagenbeck in Germany. In the United States alone, zoos are visited by over 181 million people annually. However, animal welfare organizations have expressed #Moral criticism, criticism of zoos and the conditio ...