Never seen that one,I thought at first it looked like an old poorley healed wound,it was certainly better of dead I ithink, I would have been tempted to put some gloves on and dissect that a bit, I once shot a Pheasant years ago and as the dog got closer I could stink it,it had been shot in chest, probably off the roost with the old 410 and survived it,well that was the popular opinion at the time,and it was in a state,but not swollen up as bad as that,Its a strange one, it will be interesting to see what people say about it,someone on here will be able to shed some light,on it