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In a Montana forest, scientists have been on the trail of a particularly elusive animal. Camera traps have found no definitive evidence, and experts have been unable to identify its tracks with certainty. But in recent decades, they have developed methods capable of detecting even the most elusive species. What is it? Hélène Morlon and Anna Papadopoulou explain what DNA metabarcoding is. Lesson by Hélène Morlon and Anna Papadopoulou, animation by Blok Magnaye. Watch the full lesson at: https://ed.ted.com/lessons/how-we-can...