The Nepenthes gracilis pitcher plant, found in southeast Asia, has a unique, semi-slippery wax crystal surface on the underside of the pitcher lid. Researchers have found that ants could cling to this surface under normal conditions, but a rain drop falling on the lid is enough to dislodge the insects, catapulting them into the pitcher where they are digested. This behavior can be seen in videos accompanying the published article:
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