I don't think this needs to go into emergencies, but in the picture below is the butt of one of our Cornish chicks. They are 3 weeks old and his by far has the largest red bulbus area of all. At the top of the pic the dark line is the vent and the large red mass, I guess, is below. It looks more red in person. A few of the others have the same thing but not near as big. What is this? I am thinking it is not normal. Any info would be appreciated. This is my first time raising cornish so I do not know much about them.