Raindrop impacts compress a built-in spring in pitcher plant leaves. The resulting whiplash sends insects to their doom
at the University of Bristol in the UK and her colleagues used high-powered x-rays to see inside the plants as they recoiled during rainfall.
When rain strikes the lid, it flexes down, channelling energy through the narrow neck connecting it to the pitcher and compressing a springy region several centimetres down the body of the pitcher. Then, the plant releases stored elastic energy and the lid springs upwards. The jerking motion whiplashes bugs into the trap.
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