If it's a heavier chicken they won't be able to necessarily "fly" away...but full wings will give it an advantage.
We have guinea fowl and I trimmed their wings so they couldn't roost on the joists of the coop over my head last winter. We've have a predator, very confident it's a fox...slowly picking away at the guineas the as they venture farther away away from the yard. It appears the guineas that have been taken have been the ones with trimmed wings.
We have poultry netting on hand for such an event, this is our first time using it. The remaining guineas will occasionally fly out of the fence. But then they will also fly back into the fence if something was to rush at them. We will keep the fence up until the foxes have been taken care of. I may keep it after as well but the flock will be allowed to free range again.
The red dot is where the last guinea was taken from. I was in the yard at the time. Foxes are very brazen.
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Back in my misspent youth I belonged to a fox hunting club. On Trade Days and First Mondays my fox hunting buddies and myself looked for guineas to buy. They were then released free range on our fox hunting club land, you know the better to feed mama and baby fox.