Hello! My pigeon is about 2 months old and has just recently learned to fly. He was fine up until he was about two months, and then this small bulge appeared in the middle of his throat. I thought maybe i was seeing things, so i ignored the problem. Now it's about a week later and the lump in my pigeon's throat is considerably larger and slightly more off to the right of his throat. It looks very akward on him, but it doesn't seem like he is in any sort of pain from it (not that i can actually tell). Also, the pigeon is eating and swallowing fine. Any ideas as to what this lump may be...? Or what it might be caused by...?