The Bronx Zoo is a world-famous zoo in the Bronx New York. It opened on November 8, 1899, with 22 exhibits and 843 animals and with the goal to "advance the study of zoology, protect wildlife, and educate the public."
The Bronx Zoo was one of the first zoos to move animals from cages (often organized by Linnean classification) to more naturalistic environments (e.g. "The African Plains") which would mix species and attempt to replicate the region the species arrived from. There would still be barriers so that predators and prey would be physically separated by devices such as moats, though the barriers might not be apparent to viewers.
The Bronx Zoo is owned and operated by the New York Zoological Society (now the Wildlife Conservation Society)