Hello new here. Having some problems with my flock. The other day they teamed up on a hen. They pecked her open behind the legs and it was so bad I had to cull her. Today I made the chicken run larger was about 44sqft now it is 96sqft. After the work I noticed 2 birds were bleeding from their vent. It looks like one hen is overly aggressive. But the others jump in and peck each other causing damage.