NOVAفصل 19 افزودن تصویرشماره قسمت20Sex and the Single RhinoOverviewNOVA examines the high-tech efforts to preserve the world's animal diversity. Noah needed only an ark—but today's conservationists need all the tools that biology, ecology, diplomacy and politics can muster if endangered species are to survive beyond the next century.Air dateDecember 29, 1992Runtime (min)60