动物园的存在值得深思，究竟该否关闭。石榴视频app

　　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)