av在线免费电影

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.　　一天，一个非常不起眼的小人物来到北市场，居然引起一阵轩然大波。我说还不成嘛，我当然愿意了。郑长河听了，咽了下口水，心里直打鼓：见皇上啊？他想想还是有点紧张的。世界变成了汽车人、霸天虎和Alpha Q军团争夺能量晶体的战场。No.35 Liu Chang一名男子正在寻找他失踪的女儿，但他的搜索发现了一个更大的阴谋，其中涉及唐人街破坏水权的大资本主义交易。