BBC地平线：我们该关了动物园吗？

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...