「亚洲AV无码一区二区三区牛牛」亚洲AV无码一区二区三区牛牛完整版国语_更新至第26集已完结

1960Liz 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.Silent Witness follows the work of forensic pathologist Dr. Sam Ryan, played by Amanda Burton. The series was created by an ex-police officer, Nigel McCrery - who has also published five Silent Witness novels based on the series一个时辰后，胡钧也带人上岸去了。On the contrary, the slower the shutter speed, the more blurred the moving object will be.(未完待续……) show_style();。