I heard something on hear about being able to sex them just by looking at their bills. What are you guys looking at? All mine seem to have solid blue/gray bills. Do females have spotted bills? Also do female black swedes have green heads? (I think that one is going to be a boy.) I will try and post pics but they are kinda skiddish and the zoom on my camera isn't real great. They are all a couple months old now. Pics are a couple posts down. Let me know what you think.