The louder honk noise you hear are the girls. If you listen close you can hear some softer voices that aren't 'honking/quacking'. My son and I sat down when they were 7 weeks with zip ties and just watched and listened. The ones that whispered got tagged with a loose zip tie (it still slips up and down on his leg when he walks so be careful of tightness). So now if they are all together I can look at their feet for the black ring (zip ties) that park my male.