This was on the window sill where the girls like to sit this morning. The piece of wood is about 3 inches across, to give you an idea of how large this is. It appears that someone poops very watery-purply-reddish poop. They have been eating blueberries. But, still I'm concerned it could be something else causing blood in the stool. I watched the least active, sleepy bird (buff orpington) this morning. She vigorously ate the worms and yogurt I offered. She pooped a normal poop in front of me.