Minor mutations are routine occurances. Sometimes the the splitting and recombination of chromosomes results in genes ending up in places they normally don\'t occur. I suspect that is why we have tremendous diversity within species; in chickens that would include feathered legs, bare necks, silkie feathering, and a multitude of other factors. Please note that all these don\'t change the basic fact that after these mutations occur we still have a chicken. Micro evolution within species does not translate into the macro evolution that atheists and some religionists subscribe to.