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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 Copenhagen Zoo, who killed a giraffe and fed it to the lions, to witness their culling process first hand. They think it is a natural part of zoo keeping that is often swept under the carpet. Should some animals never be kept in captivity? In a world exclusive, Liz visits SeaWorld in Florida and asks if captivity drove one of their orcas to kill his trainer.But could zoos be the answer to conserving endangered species? Liz examines their record, from helping breed pandas for the wild to efforts to save the rhinos. She meets one of the last surviving northern white rhinos and discovers the future of this species now lies in a multimillion-dollar programme to engineer them from stem cells. Veteran conservation scientist Dr Sarah Bexell tells Liz the science of captive breeding is giving humanity false hope.留下来的南雀军将领是个小部落头领，叫阿图，使一对链子锤，帽子上插了三根鸟羽。《金枪鱼和海豚》是以同名人气网络漫画为原作的电视剧，讲述母胎solo的“容陷爱”（即：马上陷入爱情）的女子姜贤镐和被称为海豚的男子韩宇以及游泳教练韩刘拉之间的爱情故事。《笑傲江湖》这样经典的武侠小说不买来收藏，简直是暴殄天物。I. Collision Inspection of BIM Technology in Metro Station Comprehensive PipelinesNBC宣布续订《芝加哥急救》第三季。