I kill several oppossums annually. They are always busted when moving about my pens or feeding stations. Lately a couple have been in area of cockyard every night leaving tracts in mud and snow along a fen between house and main cockyard. They appear to be targeting voles in the fen which are becoming increasingly abundant this time of year. Voles are so abundant my dog can catch every few minutes with minimal effort. Another interesting observation is I have two types of vole. Those in fen are dark with smaller eyes while another kind with larger eyes and brown coat looking like a wild hamster occurs mostly in woods. If you find a nest, then you often find babies. With the brown type at least the father seems to help raise the little ones. It is the voles that I think most of my predators are actually coming for. The chickens are targets of opportunity.