Artichoke Lover
Free Ranging
It looks like a possible umbilical hernia to me. If it is there’s nothing that can be done at this point. I lost a chick to one a few weeks ago.I'll be honest, I've never seen one quite like this. It's definitely very dry and won't be absorbed any further but cutting it could possibly cause a bleed, which is why others are suggesting to leave it without cutting. My concern would be that there are also intestines there because the coloration and the "string" is unusual to see even with an unabsorbed yolk sac. Is there any chance this could have been a double yolk egg? Does the abdomen of this chick look round at all like it absorbed a yolk sac?