For us it is kind of hard to say. Not all of ours have been sexed so it is kind of a guessing game.
Out of the macaws it seems to be species. The Gws are both much better talkers. They also are much better singers.
Angel our Hy is really starting to get a vocabulary. It could have something to do with Hedwig, a GW, whose cage is next to hers.
Gizmo the YSA is probably going to pass them all by. He sings and dances and talks all the time. I can't understand everything but he really mimics my voice. He does the Eagles fight song and then will quickly change to "Let's Go Flyers!". He is an equal opportunity sports fan.
Mar