Spare-o-Door by Nature House  SD-1 Spare-O-Door temporarily relpaces and door in a Nature House martin house and turns it into a sparrow trap.  Uses no bait, just the sparrow's incessent search for nesting cavities.  Bright red signal tells when trap is occupied.  Be sure to closely monitor any trap in use. Attach plastic bag to snap-in plastic cup using a rubber band (all included) to make a removal devise that allows trapped sparrpw to escape into bag without opening compartment.