So, eight weeks. Are you aware that Cornish is a meat bird, designed to be "harvested," that is, processed to be eaten, somewhere between 8 and 12 weeks of age? If they are not, they will most likely die anyway. They are bred to pack on a lot of weight very quickly. So much weight, in fact, that their organs cannot sustain them and their legs cannot support them. It is time to harvest this bird. If you cannot do it, see if there is a meat packing place anywhere around you, take the bird to them and they will do it for you. Take the other bird as well, it also looks old enough to process and it will be unhappy alone. It is the kindest thing to do, otherwise they will die slow, miserable deaths of organ failure and the meat will be wasted. I process mine between 6 and 8 weeks, when they can still walk.