Can someone please tell me what they think killed my 10 baby chicks last night? I had them in a large gray 100 gallon stock tank, away from the other 20 full-grown chickens. They were only about 2-3 weeks old I am guessing. We purchased them from a farm supply store about a week ago. On top of the stock tank, I had one of those children's playyard gates with 4 panels (doubled-over) to allow for animals to stay out/chicks in and still let air get in -it's been upper 90's here all week. Last night after I let the chicks out to play a while in the grass, I put them back in the tank and covered it and everyone was fine. This morning, I went to let them out and noticed the payyard gate that was laying over the top had been pushed to the side about a foot maybe. It was still covering one side, but there was now an opening where something got in. Seven chicks were gone with remnants of a little blood, feathers and a couple of pieces of the chicks (a piece of leg bone here, a raw hip there, etc.) Three of the chicks were still intact, but dead. Two of them were bloody on their backs, like something bit them and maybe crushed them and the third was dead and only had one little scratch on it that I could see but that scratch would not have killed it so I am wondering how that one died (maybe a heart attack after watching the others die?). Someone please tell me what you think so I can set a trap to catch the animal before it goes after my full grown birds! Uggghhh!!