ya never know , had egg thieves do something similar, they cut my whole fence and wrung my alpha hen who was broody neck because she drew blood. I try to believe the best in people but some are just kinda whacked . Like the people going around killing farmers cows and their horses just for the hell of it, Police have the blood sample and it's human but no matching data for it and ias it's not a priority probably won't get caught. So I got no problem with letting my neighbors think I'm redneck crazywhen it comes to protecting my flock , was war so sat outside with a bb gun that looked real for a couple days and nobody dares even come close, I also installed a security camera with night vision that is lots clearer than just the game cam. haven't lost a chicken or eggs sinceI’m sorry this happened to your birds and your family. I think it was definitely a canine, probably at coyote or feral dog. That way they’re lined up is pretty bizarre but I just don’t think a human would have done that much destruction to your enclosure I think a human would’ve just come in and killed the chickens and left. I lost my first eight chickens in a very similar incident except for the lining up of the bodies of course. Something tore back the chicken wire and killed all the chickens and we only found one of the bodies. Poor little Chickens don’t hurt anybody but so many things want to hurt them!