As far as Birdo, in the manual to Mario 2, I'm pretty sure it was labeled "Birdetta", but I know for a fact that it said he was a boy who thought he was a girl. I'm pretty sure "Yoshi" is a girl name too, and "he" lays eggs, which is kinda' mechanically impossible if he's a boy. I guess Yoshi and Birdo are having a gender crisis. XP