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A small red chilli hangs on a wild plant . A bird lands and eats it . Then the bird flies away . A person bites a chilli and feels fire in the mouth . The person reaches for water . The chilli has a chemical inside . It is the one hard word today . Capsaicin makes a chilli burn . Our mouth has a small sensor . It tells the brain when something is hot . Capsaicin sticks to this sensor . The sensor sends a pain message to the brain . Birds have this sensor too . But the bird sensor does not react to capsaicin . So the bird feels no burn . It eats the chilli and swallows the seeds . The seeds come out whole , far from the plant . New chillies can grow there . One study looked at small wild chillies in Arizona . Mice and rats stayed away . A rodent chews seeds and breaks them , so nothing grows . The most common kind of chilli was first grown on farms in Mexico . Scientists think this happened in central - east Mexico . So when your mouth burns , think of the bird . It eats a small chilli and feels no burn . Its sensor does not answer to capsaicin . 
