I've had pretty good luck with this method. I put the new gals, in a large pet carrier with wire door and sides (so they can see each other) into the coop at dusk, when everyone else is in. In the morning (not first thing) when I let them out I make EVERYONE from the old flock go out, and then...
My chicks and ducks got outside leaves of a head of chinese cabbage from the garden. And the rooster found himself a treat: he found a poor frog that had been living under the duck pool. He usually offers tasty tidbits to his ladies first but he wanted this frog for himself and was leading the...