i went to collect eggs this morning and noticed some blood in the nesting box. upon further inspection i found what looks to be a blood clot (?) about the size of a golf ball under their roost. it's not liquid, more meaty i guess. sorry for the graphic description. all of my birds appear fine, but i haven't had a chance to pick them up and really inspect. do they shed a lining ever, or is this really bad? this is our first go with chickens- they are about 24 weeks, all laying about a month now- some a little longer. thanks.