copkid wrote:I voted selective breeding....
Why the name of Cornish Game Hens?
From Wickpedia
The Rock Cornish game hen was originally bred by Jacques and Alphonsine Makowsky in Connecticut in 1950. By crossbreeding the short-legged, plump-breasted Cornish chicken with various other chickens (including the White Plymouth Rock variety) and game birds, the result was a small bird with all white meat, enough for a single serving.
I've also heard that they must be harvested before they can fly to be called what they are called.