From the Super Mario Wiki
“Yow! I got whupped!”
Buzzar is a buzzard-like enemy that was hired by Bowser to stop Mario. He resides in a nest at the end of Mt. Rugged during the events of Paper Mario. However, the large bird is not the smartest of Mario's enemies. 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 becomes enraged and thinks that Mario is making fun of him because the bird knows that the Princess has been captured by Bowser, and a battle commences. The same occurs if Mario tells the truth.
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. He can also return stronger and quickly defeat Buzzar to gain Star Points. After being defeated, Buzzar jumps over the edge of the mountain, never to return. He is, however, seen in the credits. His chicks then are shown.
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.
"This is Buzzar. He guards Mt. Rugged. Wow! That's one big bird! Max HP: 40, Attack Power: 3, Defense Power: 0. If you get caught in the clutches of his sharp claws, you'll lose 4 HP! Try to wriggle out of his grip. His special attack is flapping his wings to create wind. This attack damages your party members, too. But he was hatching eggs, wasn't he? Is it possible that he's really a she? I wonder...
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