I looked under that common egg problems thread and tried searching this, but was unable to find an answer.
I was cooking the other morning, cracked and egg into the bowl and it contained in a small "jellybean" shaped mass along with the yolk. It was extremely firm, almost like a stiff rubber ball.
I have a small mixed flock of Rhode Island Reds and Australorps. I'm wondering if anyone can shed some insight as to what this mass is and what may have caused it to form.