What could cause a hen to bleed from underneath (honestly not sure if it's from the butt or what but is underneath, as in like if they was sitting down on the ground this is the part that they would be sitting on). One day they seem normal, the next day they will be sitting around with blood under them & the next day they're dead. I had this happen last year & out of 15 hens only 4 survived. Now it seems to be happening again. I had one die one day then another the very next day. This morning I have another with blood on her & sitting around. Last year it was during the rainy time if spring I believe. This time it is in February but it's been unseasonably warm & very rainy. Not sure if the warming up & rain has anything to do with it but the weather conditions were the same last time this happened. I'm thinking it has to be some kind of disease since it happens to more than 1 bird at a time. Also, no idea what breed my hens are. A mutt I suppose lol. U have no roosters, only hens. Any ideas would be so appreciated . I really don't want to lose my whole flock again