I have 2 drakes and 1 hen, they are the parents to 3 ducklings that I hatched in the incubator. How old to they have to be? They were born on January 29th. They are about 3/4 feathered out. I am hatching out 10 more and I need the space for the new ones. Could I put them on with just the one drake, or would he be aggressive to them? Or weather will get up to the 40's-50's this week but at night it is still down to the teens. I don't know the sex of them. I can put heat lamps with them if I need to yet. Any help would be great.