IDK....maybe it was the snap when the trap hit the end of the rope.... I trap mice in the henhouse with those plastic tilt traps. They are made for bunny-huggers cause you can release the mouse out one end, but they work VERY well. They have an open door and once the mouses weight takes it over the fulcrum point the door closes behind them. Now it's just a closed off tetter-totter.
I think the mice run themselves to death going back and forth, because they are dead most of the time and wet, like they've been sweating heavily...weird. The chickens love them though! You ought to see them pull the guts out and chow down.
