Hi. I'm new here but so far have found the forum very educational. A little background - I have 7 Barred Rock Hens. They are about 6 months old. They have been laying regularly for about two months. They have free choice to all the layer crumble they want, all the oyster shell they want and water as well. Everything was okay until this afternoon when I saw one of their nesting boxes. See pic. The only thing I have changed is the bedding. Its brand new hardwood mulch (only 3 days since I cleaned cage and put it in) and I gave them DE mixed with their food and dusted them with DE about three days ago. When I saw the bloody mess I immediatley checked all of my girls - no signs of dried blood on their vents feathers or legs. I collected 7 eggs, so they all layed today. They were all moving as normal - nobody was lethragic or on their own in a corner. What is going on? What should I look for? Thanks in advance for the advice.