The Male Butterfly is one of the 24 Golden Bugs found in The Legend of Zelda: Twilight Princess. Like most male insects, it is somewhat green in color. Giving this bug to Agitha will reward Link with a Rupee prize.
The Male Butterfly is located around the east gate (Wii) or west gate (GameCube) of Castle Town. If Link follows down a southern path he'll eventually reach a small patch of bushes. This butterfly can be found flying around this location.