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. A Birdo makes a small appearance in SuperMarioGlitchy4's video "Cooking with Mario and Bowser 2!" as one of the customers at the rivals' new restaurant. In it, Birdo is just a quick cameo who sits at one of the tables. "She" appears in Gmod form. She also reappear 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.Birdo appears in An Overdose of Dr. Mario as Mario's replacement nurse but soon replaced by Barrage after she was killed too.