I fed Goblin a prekilled rat a few days ago. He constricted, "killed" it, and had the head in his mouth. About this time, I went to bed. Next morning, the rat was still in the cage and he was in his hidespot.
Why would he let go of the head, already in his mouth, and stop eating? The rat really was not too big for him, and since it was prekilled, there's no way I did not warm it up enough for him to want it.