Well, actually. The term Grey is used by the gaming community. The terms Silver Duckwing and Gold Duckwing are registered terms that are the proper names for the breeds as recognized by the American Poultry Association and other international poultry authorities. The gaming community refers to birds according historically famous breeder lines such as Hatch, Lieper, Law etc. Where as the in the authorized show poultry world, breeds are classified by their color with names such as Black Breasted Red, Wheaten, Silver Duckwing etc. So the terms you use depends not on the bird, but the person who you are talking to. If you are talking to a person who is into showing poultry (chickens) and you use the term "Grey" they will have no idea what you are talking about, and if they do, they will know that you are a person of the gaming mindset. Likewise, people from the gaming background will not know what you are talking about if you say Black Breasted Red, and if they do, they will know that you are from the show poultry community. This is not to say that what the show bird community calls a Silver Duckwing or Black Breasted Red is the same thing as what the gaming community calls a Grey, Hatch or Lieper. The difference is that the show bird community focuses on color, stance, weight and other technical characteristics, where as the gaming community focuses on heredity and attitude.