I hatched some Welsh Harlequin ducklings for my next door neighbor about 2 week's ago. I ended up with 2 females and 1 female. Right now the duckling's have been separated with some chick's that I had also hatched for them. They already have 3 Welsh Harlequin adult duck's being of 2 drakes and one hen. My question is when do you start letting or introducing these 2 groups, and will the 2 drakes attack the younger ones?