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How do plants talk to each other? When a leaf is mauled by caterpillars, the rest of the plant network is warned by an internal signal to boost its chemical and mechanical resistance. That resistance actually makes the plants' leaves hard to chew on, so they become less desirable to a predator. "This is an early warning system, very much like in military defense, but then more effective. Each member of the network can receive the external signal of impending herbivore danger and transmit it to the other members of the network," Stuefer explained to LiveScience.com. The attacked leaf is lost. However, the remaining leaves are protected against predators."