Which one of these is a grown-up animal?

How old are you? When is your next birthday? You are getting taller. How old is your mom or your dad? Every year we all get a little bit older and children get a little bit taller. Like you, young animals grow as they get older. They grow into adults, or grown-ups. Grown-ups have jobs. Many people go out to work. Other animals also change what they do when they grow up.