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Biologist Jeff Corwin Draws Attention to the Earth's Most Endangered Species

November 10, 2009 11:40 a.m.

Scientists estimate that more than half of all existing species on earth will be extinct well before the end of the 21st century. We speak to conservationist and TV host, Jeff Corwin, about his new book, 100 Heartbeats: The Race to Save Earth's Most Endangered Species.

Related Story: Biologist Jeff Corwin Draws Attention To The Earth's Most Endangered Species