New chicken owner so may not even be a problem but want to check. Just had let my hens out to roam around. Noticed a round lump on one of the girls chest that I hadn't noticed before and don't see on any of the other three.
That's her crop. It is a food storage organ that birds have. It holds food until their stomach is ready to process more food, and then the crop muscle pushes the food into the digestive tract. She's eating well