<Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> Gerald Durrell was ahead of his time when he postulated the role that a 20th - century zoo should play, primarily in Stationary Ark . His idea relies on the following bases: </P> <Ul> <Li> The primary purpose of a zoo should be to act as a reserve of critically endangered species which need captive breeding in order to survive . </Li> <Li> They can serve the secondary purposes of educating people about wildlife and natural history, and of educating biologists about the animal's habits . </Li> <Li> Zoos should not be run for the purposes of entertainment only, and non-threatened species should be re-introduced into their natural habitats . </Li> <Li> An animal should be present in the zoo only as a last resort, when all efforts to save it in the wild have failed . </Li> </Ul> <Li> The primary purpose of a zoo should be to act as a reserve of critically endangered species which need captive breeding in order to survive . </Li>

The emergence of a zoo by gerald durrell