Thanks for Erwin Setiady for the image on the left. Well, the confusion began when she was first introduced in the original Super Mario Bros. 2. The instruction manual says itself, and I quote "He thinks he is a girl and he spits eggs from his mouth. He'd rather be called "birdetta."" Can you believe it? That's right ... Nintendo forgot to capitalize the b in Birdette! ...... actually, what I meant to say was ... Nintendo actually has a tranvestite Mario character? *dum dum dum*

Then, as Birdo became more popular, her gender began to take a twist. No longer was this Birdo a drag queen, but he was now a full-fledged female! She appeared in future games like Super Mario All-Stars, Mario Tennis, and Wario's Woods. Her name is Japan (I believe) is even Cathrine!

Yet, fans still believe Birdo is male simply from what the original manual says. From how I've been referring to Birdo, you can tell I believe the theory that he is really a she.

Birdo obviously used to be male, but Nintendo decided that influencing a tranvestite character would be a bad idea, so they immediately changed his gender. And it wasn't hard, seeing how he looks and acts like a girl already.

Besides the fact that Nintendo simply changed his gender, I've thought of some theories behind this. Here are my theories.

1. Like Yoshies, there are more than one Birdos. They come in a variety of colors like Yoshies (there are green and red Birdos). Since there are more than one, this also means that there are different genders. The first Birdo introduced was male, while the other that we've come to know and love is female.

2. Birdetta is male, while Birdo is female. This is like my above theory; they are different characters. Like how the green Yoshi is the most popular, the pink Birdo is the most popular Birdo.

3. After firing the creator of Birdo after he or she got a sex change, Nintendo decided that Birdo should get a sex change as well.

4. If you have beaten SMB2, you find out (SPOILER!!!) that the entire adventure was Mario's dream. In that case, the Birdo Mario met was the only male one that ever existed. Then, Mario actually met a real Birdo, which only come in female form, and began dreaming of female Birdos when he had the same dream in Super Mario All-Stars and Super Mario Advance.

5. Or, Mario is really a tranvestite, so he dreamed about a tranvestite Birdo. Of course, I don't believe this one much.

6. Let's hope these are different Birdos we're dealing with, or else Yoshi is dating a Birdo that used to be a guy .... or maybe still is. Poor Yoshi ...

7. Mario and the gang had beaten up Birdo so many times that there was a slight accident ... ouch ... of course, since Birdo wanted to be a girl, this was actually helpful. I guess ... eww ... ^_^"

8. Why would a male Birdo produce eggs? Wait a minute; male Yoshies produce eggs (and not through their mouths like Birdos, but the good-old fashioned way ^_^"). Maybe only male Yoshies produce eggs and only female Birdos produce eggs. Hey, this is a crazy fudged-up world Mario lives in!

9. If you were a pink dinosaur with eyelashes, yellow fingernail-polish, and a red bow that produced eggs, you'd think you were a girl too! Nintendo did him a favor.

Now, I still believe that Birdo is female and always was, and that Nintendo was on crack when they wrote her description in the SMB2 manual, but many people don't. What's your theory?

According to a not-so-recent poll on the site asking the question "What do you think Birdo's gender is," the winner was "There's more than one Birdo." That could quite possibly be the best answer. Birdetta is the tranvestite, but Birdo that we know today is the true female one. There ya have it!