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How to pet a chicken
Be quiet.
When approaching a chicken to pet it, you need to try not to make loud noises. Any loud noise you make could startle the chicken and scare it away from you.
You don't need to be so sneaky that the chicken doesn't hear you, in fact you want it to know you are coming, but you should make only small amounts of noise. If you are helping a child to pet a chicken, remind them to be quiet before you start approaching the chicken.