In central Louisiana, it was common for several hens to dump eggs, sometimes one hen would try to brood 30 + eggs. Usually about 8 or 10 would hatch, then time permitting we would clean the boxes out and get more nesting activity.
The 2 hens at one time is bizarre, I had not heard of that before. Our biggest nuisances were red wasps and rat snakes.
Bobcat predation was documentd on boxes over land in some areas, but we usually put ours over water.
