I bought my Sebbies as goslings from a friend who bought them from a hatchery. They are whites and were a couple of weeks old when I got them so they were not still in down to try to sex them that way. She tried vent sexing a couple then found she could have killed them doing it so I have one that might be female and the other two are a mystery. They were past the initial down when she got them, they were not day olds. I think it's kind of cool that they went from a yellow down to a snow white down as they are feathering. Is there anyway to sex them by behavior? their sounds? beak color? tail feathering? anything? Of the 3, one seems more independent and will wander off a little distance alone and doesn't seem bothered if it can't see the others. The other 2 are stuck together like glue and fuss if they are separated visually so I just wondered if this was a clue to their sex, 2 males and one female? one male and 2 females? I'll find out eventually but thought it would be fun to ask for opinions or others experiences and see who is correct.