Some rabbits are just more vocal then theothers. My first bun Fluff used to make a sound awfully closeto the Cadbury Bunny's clucking. Gir makes snuffling noiseswhen he is displeased, and Guin chirps when she is happy.
To check if she is really a girl, gently cradle her on her back in yourlap, and gently press down at the top of the organ between herlegs.
As Pam has said, if the protrusion looks like a cheerio or a tube, thenPixie is a boy. If the opening looks more like a taco, or aslit running down towards the anus, then she is a girl =)there are some sights with good picture references. googling"sexing rabbits" is usually a good way to get to them!