Birdo, also known as Catherine, is a recurring character in the Mario series. She first appeared in Yume Kōjō: Doki Doki Panic (夢工場 ドキドキパニック), a Japanese game featuring Birdo as the first boss. After its release in Japan, Nintendo of America remade it, featuring Mario characters, but kept the enemies and bosses the same. This remake was known to be Super Mario Bros. 2.
Birdo later appeared in many Mario spin-offs like Mario Tennis. She is voiced by Kazumi Totaka.