Sorry for this long post but hopefully the details will help with diagnosis. I have 3 houses and 2 tractors: 1 tractor has 23 pullets the other has a single roo, a lil house w/3 hens & caged run. 2 bigger houses with caged runs both covered to prevent aerial assaults but there are areas up high where a climber could squeeze in. 13hens, 1 roo & 18 6 week old chicks in 1 and 25 hens & 1 roo in the other. Im ouuta town and father-in-law is minding the farm. Yesterday evening all was well. Tonight the 3 hens are dead, the 13 hens/1roo and 5 of the 18 chicks are dead. Birds in tractors are all ok. There is other damage too. The house with 25hens/1roo are all fine but the water supply line is pulled off. The house with 3 hens has the water supply line broken off the reservoir. The house with 13/1/5 dead has the water system intact. Father-in-law says birds show no signs of trauma and are all intact but there is a bunch of feathers all about the run and the house. Is there a predator that would kill for sport? Called a buddy who is a commercial broiler inspector and he says he cant think of a virus/illness that would kill that quickly. He suspected sabotage. Eggs were collected yesterday about 1700 and there were eggs in both houses where the dead birds lived so indications are this happened during the day today. Im sick about this and am looking for any input from more experienced folks. This is only my 3rd year with chickens.