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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.她多大了？咋还没嫁人？李敬文心里忽然就亮堂起来，微笑解释道：她还不算大。大声道：将军有句话说的好，‘军中同袍。一日刘苹果的好友小妹因为得罪客人而被开除，二人喝得酩酊大醉。神志混乱的苹果误打误撞走到一间足浴客房，正好是林东的休息室，二人发生关系，却被正在刷窗的安坤看到。红椒拎着那块冷肉傻眼——咋都不馋了？板栗使劲扯紧手中的绳子，哪里能扯得住，这狗儿发狂起来，比那惊了的马儿也不差。