In animal world , they always evolve by mutation . Sometimes it's good . Sometimes it's bad . For mutation I have an idea about that chicken can fly as a bird .We all know chicken looks like bird , they have wings but they can't fly as a bird .
Those chicken in farm are been domesticated long time ago .But those chicken in the wild will fly as a bird because they have to adapt the environment . They have to feed themselves every . So that must be improve their flying ability . That will make their predators feel (insect) some threat . The population of their predators will be reduce .
I think this is the result of natural selection .
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