I feel your pain!!! I lost 10 two weeks ago, 6 broilers, 2 leghorn Roosters and 2 leghorn hens, that just started giving eggs!!! Thought it was to a coyote, turns out it may have been a fox. My trail cam got many pictures of a fox circling the chicken run on Wednesday morning, he was there for an hour just looking for a way in! He did end getting my 1 Brahma, I think she paincked and few out. What really sucked is I just got her Sunday at the county fair! Eleven birds in 2 weeks, the gloves are off now, it's war!! I have two havahart traps set baited with Mc D. French fries, and two guns next to the door just waiting to catch him in the act. BTW If I get him in the havahart I will drive him a long ways off and release the fox, I'll shoot him but not execute him. I also am going high tech, tommorrow I am installing three IP security cameras, two with IR capability (night vision). The monitoring software will email a picture to my phone the instant anything moves through a preselected field of view.
It is only a matter of time till my wife has a new Fox stole around her neck!