The first two Birds are not needed in this level, however, they can be used to accumulate more points. Shoot the Blue Bird at the Glass portion of the structure, and the Yellow Bird at the Wood portion. Shoot the White Bird directly at the base of the structure where the Stone vertically piles up, and fire its egg right before it hits the stone. If done correctly, the impact of both the explosion and the flying bird will knock over the entire structure, killing all of the Pigs. The 2 unused Birds award the player 20,000 extra points.