I have 3 month old chickens (6 hens, 1 rooster). I introduced 4 week old guineas to the coop about 4-5 days ago. The chickens did some dodging at the guinea at first but they've done pretty well together. They free range during the day, the chickens sleep in the coop at night and the guinea roost in the run. This morning I went to let them out and 4 of the 6 guinea were dead. The remaining 2 are bloody and ruffled but still walking around. Of the 4 dead, 1 is obliterated and it appears from something outside the coop, through the chicken wire. Two are missing heads. Could my chickens have killed them or is it something else? We have chicken wire buried around the exterior and no sign of entry.