They disappeared, never to return.
And the question, yes. There are 3 colors of Birdo: Green, Red, and Pink. Pink shoots only eggs. One of the other 2 spit only fire, and one of the two spit fire and eggs.
Anyways: My guess... Since I think... I'll guess only fire then. I remember the Birdo in 5-1 is an only fire one.
Everyone has their own opinions, no matter how WRONG they are.