动物园的未来：我们需要关闭它们吗？一二三四免费观看在线影视大全

　　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... (展开全部)