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Ever since the North American release of Super Mario Bros. 2, Birdo's gender has been at issue. The manual asserts that "she" is a male who believes he is a girl, and would rather be referred to as "Birdetta". Later versions of Super Mario Bros. 2 make no mention in either the manual or the video game itself. Later works from Nintendo have changed the gender back and forth, including Birdo as a love interest for Yoshi. The gender confusion is given specific mention in Super Smash Bros. Brawl and Captain Rainbow, the latter involving a plot that requires players to prove Birdo is a female.

I know Birdo's a tranvestite; just fooling around.