Two groups of plants exhibit such intriguing behavior that a century and a half ago they attracted the attention of Charles Darwin. These same plants, the orchids and the carnivorous plants, still fascinate scientists today. In two one-hour films, Plants Behaving Badly reveals a world of deceit and treachery worthy of any fictional thriller.

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On CPTV: Wednesday, May 10 at 10 p.m. (Part 2: “Sex & Lies”)