The ancestors of domestic chickens were wild. At that time, they could also fly. Since humans raised them as poultry, their wings degenerated after training. At the same time, they gradually got used to the living environment on the ground. Over time, the ancestors of chicken with wing muscle tissue were wild. At that time, they could fly. Since human beings raised them as poultry, their wings degenerated after training. At the same time, I got used to the living environment on the ground. Over time, the muscle tissue of wings degenerated and the body became heavier and heavier. This has been passed down from generation to generation, so today's chickens can hardly fly, degenerate and become heavier and heavier. This has been passed down from generation to generation, so today's chickens can hardly fly.
Why can't chickens fly? Why can't chickens fly
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