Liz Bonnin presents a controversial and provocative episode of Horizon, investigating how new scientific research is raising hard questions about zoos - the film explores how and why zoos keep animals, and whether they need to change to keep up with modern science or ultimately be consigned to history.
Should zoos cull their animals to manage populations? Liz travels to Copenha...
演员：鲁比·罗丝 弗兰克·格里罗 帕特里克·施瓦辛格 小路易斯·达·席尔瓦 梅杰·道奇 Emma Maddock James Di Giacomo Danny Bohnen Eden Harper Scotty Bohnen Anna Grace Loman Raphael Alexander Edwards Marco Ramirez Scott Moore Michelle Colón