A cornish cross is the product of a white cornish roo and a white rock hen. Those are aweful looking poor little chicks. I hope people keep an eye on this thread and those photos as an example of "just because you can do something doesn't make it a great idea".
Why? They don't breed true to type. you won't hatch a chicken with the same characteristics of the parent.
They are a cross of a white cornish roo and a white rock hen. They have been cultivated for decades so that when they mate the hens by the roos the eggs produce the chicks you are growing...