Carol Buckley spent more than 20 years performing with her elephant, Tarra, in zoos and circuses before deciding the animals deserved a different life.

As early as 1796, traders began shipping Asian elephants to Europe and North America. By the 19th century, Asian elephants were a staple of zoos and traveling circuses.

NATURE explores the unusual problems created as the struggle to give Asian elephants a home is fought worldwide.