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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.从洪荒年代以来，积累了五十六亿年的因果，今朝爆发。她就是要红椒去面对田遥，看是否真的能放下。　　通过孙光明美食家的身份和徐唯一新媒体宣传方面的不断努力，后石沟村的蔬菜渐渐的回到正轨，开发了民宿旅游这一项目，并结合现在国家进行精准扶贫这一政策，借助农村贷款这一优势，将村中的贫苦户逐渐带入正轨。海田的事找婶可以么？可以，她说话比我管用。Netflix宣布续订《马赛城》(Marseille)第二季Sexual Assault Bannell