Buzzar

Buzzar is a buzzard-like enemy that works for King Bowser. He resides in a nest to the side of the Mt. Rugged bridge. During the events of Paper Mario, Buzzar was ordered by Bowser himself to stop Mario at all costs. However, the large bird is not the smartest member of the Koopa Troop. As such, when Mario is stopped by Buzzar on the mountain bridge, the plumber can claim his name is Luigi. Since Bowser is looking for Mario, not Luigi, he allows the hero to pass and continue on his adventure. However, if Mario claims his name is Princess Peach, Buzzar realizes he has to capture the "princess" and return her to Bowser (As such, a battle commences.). Of course, if Mario tells the truth, he will have to fight the bird boss.

Note: If Mario claims he is Luigi, Buzzar will continue to stop Mario every time the plumber crosses the bridge. As long as the hero keeps saying he is Luigi, Mario never has to fight this boss.

Interestingly enough, Buzzar is mentioned in Paper Mario: The Thousand-Year Door. The entrepreneur Lumpy actually travels to Mt. Rugged, and has his backpack stolen by Buzzar. Mario can read about this event in Lumpy's diary.

Although Buzzar is referred to as a he, the bird might actually be a she, since Buzzar is seen incubating eggs in a nest. However, although extremely rare, some species of birds actually have the male parent incubate the eggs.