HI All... I came home today to find one of the girls bleeding, really bleeding from her behind... It doesnt look like its from the vent... after examining the others (i have 16) I noticed that 2 others are doing the same, but not as bad... I took the two worse out of the coop and separated them... What should I do?? and what is causing it?? I also noticed that they are pecking their behinds to, anything I can do for that?