Birdo is actually a guy... who likes to be a girl. That's right, a transgender Mario character. XD

The original SMB2 booklet said, "Birdo thinks he is a girl and likes to be called Birdetta. He likes to wear a bow on his head and shoot eggs from his mouth."

He is usually just referred to as a girl (apparently cos he likes it that way XD), but in Super Smash Brothers Brawl, Birdo's trophy labels his sex as "indeterminate" and the game refers to him as an "it" XD

So yeah, Birdo's technically a guy... but we'll all humor him and say he's a girl ;)

Birdo character wears a red bow, a diamond ring, and appears to have a close relationship with Yoshi!
It's clear to me that she is a female!

I'm not sure, but i think he is a guy because thats what they say in Mario games.

He's a guy, I heard this on X-play when they were reviewing a Mario Baseball game.

Birdo is beleived to be gender comfused. Actually a male Birdo, but It is beleived by many that they wanted Birdo to have a relationship with yoshi and changed it, though it's gender has been changed many times, I don't think we'll ever know for sure.

well LuigiFan55 is right i think birdos a guy to because that is what they say in Mario games

a girl.

DON`T REALLY KNOW BUT BY THE LOOKS IT IS A GIRL BT IT IS REALLY A BOY !

Birdo is a male, in the early games "she" had a really deep voice and in mario rpg the guy "she" was dating paused every time before calling it a dame.
The relaitionship with Yoshi? That kinda makes sense, I'm almost sure Yoshi's a girl!

look @ it this way:
Yoshi; High voice and lays eggs
Birdo; Low voice and shoots fire-balls and eggs

plus to the best of my knowledge, Birdo was an enemy (like a goomba) in the really early games..

birdo is a female duh!

Transgender, But they propably just switched from male to female because in the old games on the snes they called it a he, but now its metioned as a she.

I think she's a girl because while she is referred to as a male in the earlier Mario games, she is now mentioned as a female in the more recent Mario games.

Or here's a better answer, Birdo could be a male in Japan, but female in the US. I think that could be it.

well from the sounds of it, it is a guy who would rather be a girl, possibly from the color he is his was tired as a kid and said wtf so from that point on he says he is a girl but if he was initially refereed to as a guy in the older games, the newer game makers are portraying him as a girl so the kids will not get confused. But yes he is in fact a very confused MALE!!!!
3.bp.blogspot.com/_tzKQYLdFGG0/RfEbDu7hIrI/AAAAAAAAALY...jpg

Birdo's gender has been switched from male to female over the years, but I think Birdo will stay a female since number 1: the diamond ring and big red bow on her head, and number 2: she has a relationship with Yoshi. Of course, if I'm wrong, Yoshi and Birdo are both gay.

Birdo is transgendered...it has both sexes so it is both male and female...
that is why no one really knows if Birdo is a guy or a girl.

femail because of the bow

She wears a bow,is pink,and acts like a girl with that said i think she's a girl.
Wait she can be a gay guy....
i'm confused now?!

Hey everyone if people say Birdo is a boy then is Yoshi a girl? and Yoshi seems like a boy and I don't think their gay so I just think Birdo is a girl

Apparently, Birdo is male and Yoshi is female...
Birdo is a crossdresser, and Yoshi lays eggs. And And males don't lay eggs.
Not sure what to say about that...
:/

i personally think that birdo is a female, but some people beg to differ. He/She first appeared in Super Mario Brothers 2 as a male. In Japan, they refer to him/her as male. Nintendo has switched Birdo's gender back and forth, therefore, not clarifying whether he/she is a male or female. In som games, Birdo appears to be a male, and some (mostly more recent games) a female. As for Yoshi, I don't see why people argue over HIS gender. Yoshi is a boy.