Venus flytraps can count how many times they've been touched.

Each trap has tiny trigger hairs on its inner surface, and the plant won’t snap shut after just one touch. It takes two separate touches within about 20 seconds of each other to close the trap, a mechanism that helps the plant avoid wasting energy on false alarms like a raindrop or blown debris.

Research has shown the plant keeps “counting” even after closing. Additional touches from a struggling insect trigger the release of digestive enzymes, with more stimulation prompting a stronger digestive response — a surprisingly sophisticated form of signaling for an organism without a nervous system.