The Bird Barrier Wooden Sparrow Trap (tt-wst) features a bird house like design that surprisingly conceals a hidden trap inside. This will effectively captivate and prevent English sparrows from messing up at your place. The trap is constructed out of wood and it is built with a panel that easily drops down. Once a bird lands inside the unit and reaches the perch, the door will swiftly close. The beaming orange sticker allows you to monitor the status of the door from a distance. The entrance hole in the trap measures 1.25 inches.