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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.徐文长十分自信地给出了这个很不自信的答案。"Vietnam is rich in bamboo rats, I did hear some veteran comrades who took part in the 79-year border counterattack say that, It is said that many wounded and sick people did not have time to withdraw from their positions and were bitten or even killed by bamboo rats. This has happened to both the Vietnamese army and our side. Moreover, bamboo rats also like to go out collectively to eat the bodies left over from the battlefield. Is it because swarms of bamboo rats attacked position 142? However, the size of bamboo rats is not large, so it seems a little inappropriate to say that they are "big rats". "I went on to ask.谢雯婷在北京打拼多年终于当上了咖啡店店长，攒钱买房准备与相恋多年的男友结婚，却惨遭对方劈腿，“裸恋”十年后沦为奔三“剩女”。从此她决心对爱情分散投资，开始周旋于四个类型迥异的男人之间。四个男人都各有魅力，却也都各有风险。究竟谁是回春的桃花运？谁又是伤心的桃花劫？也许幸福，只在于选择。在幻兽大陆上，在这块人类居住的大陆上，不同的幻兽决定了不同的命运，一个平凡的孩子，进入了这个幻兽大地，并如何成为幻兽王的故事。