had the very same problem last year where a farmer was letting out his bird's in the morning and was down 1 or 2 once or twice a week. we had snares and cages set with no luck and they were still been taken, so we went to the nearest place where there was a field of nice dry cover, hid behind a water trough and started squeeking(rabbit destress) and in the space of 5 min's had 2 foxs bagged.. there was no problem after that..