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Birdo is a possibly gender-confused/trans-gender creature of a dinosaur-type species that first appeared in the video game Super Mario Bros. 2. It serves as Yoshi's partner.
In it, Birdo is just a quick cameo who sits at one of the tables. "She" appears in Gmod form. She also reappears in the blooper "SM64 Tales: Thwompin' and Whompin'" as a sprite from SMB2.
According to theories, Birdo is a transexual because "she" says "she" is a girl in the Nintendo games, but the Nintendo guidebook says Birdo is a boy. Also in real life, Birdo is Yoshi's partner (that is, Yoshi's girlfriend... or does that mean boyfriend!?).
Birdo appears as a cameo in SMG4: Mario The Ultimate Gamer.
Birdo also makes a cameo in SMG4: Stupid Mario 3D World.