Birdo is just a birdo. Maybe even the female equivalent to a Yoshi? Like how a cow is the female and abull is the male. Could anybody please provide proof of there has ever been a female yoshi in a canon Mario game? If there aren't any, my theory is most likely correct.
Must have: Legend of Zelda: Skyward Sword, Kid Icarus: Uprising, Paper Mario, Kirby's Epic Yarn, and Donkey Kong Country Returns.