Any of you folks who know more than I care to suggest why my 4 year old Buff Orp, Sunny, is bone thin? I picked her up and noticed that you could cut meat with her keel bone. All the others in her group are fat and sassy. Sunny is almost four-and-a-half and still lays at least three eggs per week, all great shell quality. She is fed regular laying pellets with animal protein and gets extra protein once a week, at least, in the form of fish, plus yogurt and vitamins. She and her entire group were wormed a few weeks ago, due to all the mud and rain and me seeing roundworms on top of the soil. Figured it had to be worms if she wasn't having reproductive issues. Her abdomen isn't bloated or odd-feeling. She is just alarmingly thin--the only time I've seen them this thin here is when they are close to dying of internal laying. Her color is good and she seems energetic enough. What other internal issues would cause this?