If you want to know what animals roam your land after sunset, you’ll need a drift fence, a sampling technique biologists favor. A drift fence is a fence of canvas or aluminum flashing, 18 inches or so high and as long as you like. Along the fence’s length, every fifteen feet, you need to sink five-gallon buckets flush with the ground. When animals drift through the forest pursuing their animal quests, the fence herds them along its edge. As they make their way along the fence, t