I just got a crested kahki, a black runner, a b&w magpie & a blue swedish to go with my 2 mallards. The mallies are about 8 weeks old & the rest maybe a week. My mallies have been outside since about 4 weeks old. I put them in with my 1/2 grown chickens 1st to make sure they were warm enuf at night. The ducks took 1 nest box & the chicks took the other 5. There really wasn't any fussing or anything cuz they had all been around each other quite a bit before I put them in together. Of course, they were the only ones I had to go lift into the coop at night (they didn't care for the ramp) & they were the first out in the morning when the coop hatch was opened (had no problem going down the ramp). Once I completed my duck pen, 1 side of which is connected to the chicken coop, they did just fine going in & out of their duck box at ground level on their own. They have been perfectly warm & cozy & our weather here in Ohio is just as crazy as the weather up there. We have had everything from close to 80F clear down to 30's since they went out. As long as they are mostly feathered & you have adequate shelter they will do fine.