Model 501 can catch and hold 20 or more sparrow sized birds at one time. Bait your target area with food and water for several days before setting this trap over the feeding area. When trapping birds it is important to keep a water source in or near the trap. This trap measures 24L x 12W x 8H and is constructed of 1/2" x 1" wire mesh. The trap door funnels have a 1.5" diameter and can be adjusted smaller by bending the tines at the end of the funnel.