This AM in the coop there was a giant poop. My gals are 17-18 weeks old and typically their poops are as big around as a Bic pen. This AM, there was a poop as big around as a thick magic marker. The color was normal, with a white head on it. Is this normal? It looks just like the other poops, just BIG. They get various table scraps, including recently some cooked squash seeds with a little butter. How long does it take something to go through a chicken?