I don't care about my chickens flying, but I have several ducks I have to clip wings on while they're free ranged. Muscovy and calls are both really good fliers, and I've had a scovy hen get lost on our property because she flew too far and didn't know where she was when she landed. Another scovy I have is blind on one side, and she follows the others when they fly, which could be bad for her If she got lost. They're safer in the long run if they have clipped wings in my set up, but every set up is different.