by far the best thing to put down is corrugated sheet metal. wild animals seem to love it... just dont put it on the dirt because if it rains the mud will cover the whole thing try placing it on tall grass or on some leaves.
Oh also if there is a trail in the forrest or wherever your putting this in than try to place the sheet metal like 50ft of trail but somewhere where you wont forget where it is.
ive had better luck putting it farther away from the trail rather than close to the trail.