动物园的存在引发争议，保护物种与动物福利之间的平衡亟待思考。人犬交小说集阅读

　　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)