Koopa Paratroopa (also known as Para-Koopas, Sky Troopas in Super Mario RPG: Legend of the Seven Stars, or simply Paratroopas) are winged Koopa Troopas. They lose their wings when they are attacked in the air, such as getting stomped or hurt by fireballs, turning them into regular Koopa Troopas. Typically, Koopa Paratroopas are placed in large gaps where Mario and Luigi must stomp on rows of them to traverse a pit or reap other rewards. They traditionally come in two varieties: Red Koopa Paratroopas usually fly up and down in a set path, while Green Koopa Paratroopas often bounce in the player's general direction or fly back and forth, although many exceptions have been made of these rules. Red Koopa Paratroopas first appear in World 1-3 of Super Mario Bros., while the green ones first appear in World 2-1 of the same game. Koopa Paratroopas have also appeared as playable characters in various spin-off installments, occasionally even appearing without a normal Koopa Troopa as a playable character; in these installments, the red Paratroopas are the default color, having appeared first, and the green Paratroopas are the alternate color, having appeared later. Their name comes from "paratrooper," a term used in the military to describe soldiers who parachute down to attack.