It depends on your definition of “natural”. This fully naked chicken is exactly as natural as a Turken, but it wasn’t nature who shaped it like that - it was people. Nature produces lots of mutations, but not all of them survive. These naked chickens would not survive in nature, so they wouldn’t have even existed without our intentional selection and breeding. I’m sure people could breed elephants down to the size of rats (see the size difference between a great dane and a chihuahua - both the same species). Doesn’t mean it would be natural though.