A deadfall trap is when you take a heavy object such as a rock or log and lean it upright with a stick undernieth supporting the weight. On the stick, tie some bait. When the animal comes to eat the bait, they jiggle the stick and the heavy object comes down and either knocks them out or just completely crushes them. Its kinda hard to explain but you should be able to do a google search and get directions on how to set them up.