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...
全部來源：【迅雷下載】【愛奇藝】【電影天堂網】【優酷視頻】【百度云播】【星辰電影】【bilibili】
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