I have 4 calls... 2 boys and 2 girls 5 months.... my boys both have the olive green on their bills.. I have an all white female that i remember let out her first HONK !!! I was crackin up... she is still VERY loud... my other girl can get somewhat loud but she is almost as quiet as the boys.... and at about 3ish months the boys started getting their drake curls. from my little experience Id say the left is male and the right one is female..