'Carting' is when captive animals are moved by trailer to a location then released to be hunted.

BBC: Newsline investigates deer carting issue

Captive animals are difficult to return to the wild.

ECONOMIST: From zoo cage to modern ark

Dr. Kenney, who died Feb. 14 at age 77, played physician to all the marine park's captive animals, including penguins, dolphins and Google the Great, a one-ton elephant seal he personally bagged in Mexico.

WSJ: The Whale Doc Who Kept Sea World Healthy

Some people believe the only viable solution to the trade of wild animals is captive breeding.

BBC: Should the location of newly discovered species be hidden?