Gust (Ex): As a standard action, a Pidgey can trample creatures it flies over. The Pidgey merely has to fly above the enemy within 5 feet of it. A Pidgey's gust attack deals 1d3 + Dexterity modifier untyped, nonlethal damage. A gusted opponent may attempt an attack of opportunity with a -4 to the attack roll (assuming that it has a reach of 5 feet or more). A gusted opponent who chooses not to make an attack of opportunity may instead attempt a Reflex save for half damage (DC 10 + 1/2 Hit Dice + Dexterity modifier).