Naval Piranha is the main boss of World 3 in the game Super Mario World 2: Yoshi's Island for the SNES. The creature is a female Piranha Plant who gets super-sized after Kamek uses his magic to make her huge. The creature's plans is to get Baby Mario kidnapped, and to eat Yoshi for lunch. During the fight, she will try to ram into you, toss spikes, or send her vines toward Yoshi. Naval Piranha Plant, to many, is one of the more popular bosses in the game, other than Baby Bowser.
Initially a creature that greatly resembled Naval Piranha was going to appear in Yoshi's Story for the Nintendo 64, but for whatever reason was taken out.
In Germany, Naval Piranha is known as Audrey, a reference to the plant Audrey II from Little Shop of Horrors.
It is unknown why Naval Piranha is female. Most players, especially unintelligent or those who don't much about her, calls her 'he' or other males word. The only truth that she is female. There are no signs telling her that she is female. She is one of few enemies to be female rather than being genderless nor being male.