Why Can't Chickens Fly, Even Though They Have Wings?

Chickens have ' But no matter whether they are roosters or hens, they can’t fly in the sky. Why is that?

The chickens we see today have evolved from wild ones. Long, long ago, the wild chickens lived in forests. There was a kind of wild chicken with red feathers that looked and sounded like present chickens. They flew in forests and have a free fife. Later, because people wanted to eat the eggs and meat of chickens, they caught them and put them m cages. The wild chickens could no longer fly freely in the forests, and their appearance and habits changed slowly. After long years of being raised by people, chickens have become fat, and they don’t use they wings as they used to. Gradually, they lost their flying ability, so they don’t fly in the sky any more.