Backstory: I was driving down the countryside, and like a lot of people, I was instantly reminded of DayZ when I saw all the familiar buildings and forests. As I drove past a big silo I got a little nervous, probably due to a lot of bad experiences with Snipers on the roof of the silo in Cherno. However, I looked up at the silo and saw a flock of birds perched on the roof and thought "No, there couldn't have been a sniper up there, the birds would have been scared away." The suggestion: What if there were random flocks of birds perching on rooftops and trees throughout the game that get scared away when someone comes near? So for instance, if you saw a group of birds sitting on a rooftop you would know there probably isn't a sniper up there, because he would have scared the birds away. Or even better, if you suddenly hear the telltale sound of a bird and then look up to see a small flock of birds flying away from the trees, it'd be like an alarm-system that someone is coming. Maybe the birds only react to people running, so they won't get startled if you sneak past them or if a simple zombie walks by. Should they only alert you of other players? Should they warn you of incoming zombies? Do they attract zombies to your location if you startle them? I don't know, I'm not a game-designer, I just thought it was a cool concept.