I am a long time keeper of chickens - have a nice coop and pen, but let them run free in my field/yard most days, lock them in at night. Tonight I went up to close them in after dark, having seen them all well and healthy at 6 pm--- only to find my 33 pullets all killed and left dead all over the floor. A door was open that had been locked with a hook and eye latch and whatever killed them was able to get through a narrow shoot to their outside pen where there were also many dead chickens. Not a single young hen is left alive. My eight older hens roost in the rafters, and they are all there. The young ones who cannot fly are all dead. I am SO sad. I have kept chickens for a dozen years and am used to the random loss of one or 2 here and there to hawks, owls, dogs, raccoons, coyotes or whatever. But this is HORRIBLE!! We had so many nice breeds and they were becoming beautiful friendly young hens. They were anywhere from 10-13 weeks old. None of them appear to have been eaten, but I will inspect more thoroughly in the daylight. What would do this?? It seems whatever it was it figured out a latch (? jumping?, hands?), and could get through a small space (a shoot about 8" wide by 14" high). I've never seen a weasel or a mink around here (Portland, OR) but don't know if they're around. I didn't smell skunk. I didn't see evidence in the yard of a struggle....no excess of feathers or anything. We have caught few rats over the years around the feed room, but very intermittently, and none lately. I appreciate anyone's help with this mystery. I'm heartbroken!