Yesterday at Petco I noticed a number of the bettas that they had for sale had bulges in their neck area. It was in the exact spot that a human would have a thyroid goiter. Some were fairly big and some were just barely noticeable. I did not buy any of these fish but it got me wondering. I've tried to do a little research on their anatomy since I am fairly new to betta keeping, however, I have found varying anatomy charts that haven't been able to answer my question. Does anyone know what I am talking about? I am just curious for future reference in case any of my boys suddenly get these bulges. Thanks!