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All living things send messages. People talk face-to-face, write letters, and make phone calls. They also use
"body talk," like shivering to say, "I am cold." Animals send messages to each other too. They make sounds, leave smells, and act in special ways. By doing these things animals warn of danger, set rules for leadership, and tell other animals they have found food. What is the main idea?
What is All living things send messages?