Lost one and had three injured last night. $ week old chicks in a wire brooder. Bottom is wired with 1/2" hardware cloth. No breaches in the wire, whatever got'em reached from the bottom, pulled feet and toes through the wire. The brooder sits on saw horses about 36" off the ground. This is what I have done for the injured. Medicated with antibiotic, put card board down on the bottom of the brooder so whatever is reaching through cannot reach through again. Going by the hardware store and I am going to get several large Victor rat traps. I realise that if it is a coon or possum the rat traps will not kill it, but it dang sure might discourage anymore preditation. Because I live next to 400 undeveloped wooded acres, I new I was going to have a predator problem. however I thought my brooder was pretty well protected. This incident discourges me allot, I know that I will never be able to relax and enjoy my chickens, something will always be after'em.