Actually, females are quite easy to recognize by the behavior. I don't know how old yours is, but if you have had it a couple years you should know by now. They have to be "of age" so to speak for this to show, but females cut "feathers" out of any paper at hand for making their nest and they will be very active at finding some nesting area.
My brother's female started doing that quite young and chewed up any paper in sight in the process. Unfortunately, they also get very territorial as a result of the nesting desire so she is quite bitey and no longer walks around on her own. She also started laying eggs, so that's a sure sign of female! She also enjoy cranberry juice!
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