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A Venus flytrap's hinged leaves snap shut in under a second, but the plant doesn't clamp down on every raindrop or falling leaf that lands on it.

How does a Venus flytrap tell prey from harmless debris?

Tiny trigger hairs must be touched twice within about 20 seconds
Each trap has several sensitive trigger hairs, and the plant only snaps shut if two hairs are touched, or one hair is touched twice, within roughly 20 seconds — a safeguard against wasting energy on rain drops or debris, and after closing, the trap only starts producing digestive enzymes if continued struggling confirms real prey is trapped inside.

A Venus flytrap uses tiny trigger hairs that must be touched twice within about 20 seconds, or one hair touched twice, before the trap snaps shut, a safeguard against wasting energy on raindrops or falling leaves that only brush a single hair once.

Smelling exhaled carbon dioxide and sensing body heat are real mechanisms elsewhere in nature, such as how some insects find hosts, but not how a flytrap works, its detection is entirely mechanical, based on touch rather than chemical or thermal senses.

Even after closing, it does not immediately digest, only producing enzymes once continued struggling confirms real prey is trapped, an extra layer of energy-saving caution built into the plant's behavior.

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