Do you remember the Northern Spotted Owl, icon of the old-growth Redwood Wars of the 1990s?  Well, the Northern Spotted Owl is, once again, under threat.  This time, however, the threat comes from another species of owl, the Barred Owl, a larger and more aggressive bird native to the United States, whose range has been expanding westward as a result of development and climate change. The U.S. Fish & Wildlife has devised a plan to protect the Northern Spotted Owl: shoot Barred Owls.  Scientists, conservationists and the public are torn: should humans intervene to prevent animal extinctions by competitors and invasive species if they threaten the survival of endemic ones, or should we let nature take its course?  And since humans have intervened in nature for thousands of years, everyday and everywhere, what is the right thing to do?  How can we decide? Join host Ronnie Lipschutz for a conversation with Hugh Warwick, spokesperson for the British Hedgehog Preservation Society, who has been looking into this dilemma around the world. He has just published Cull of the Wild: Killing in the Name of Conservation.  Warwick is a frequent speaker on wildlife conservation in public talks and on British radio and TV. He also runs courses on hedgehog conservation. Warwick with hedgehog photo © Zoe Broughton