UPDATE:
Since I last posted here, we learned that Bianca is actually BiancO, a roo.
I had a freak-out about that, since I won't return him (to what would be certainly a horrible fate) and I don't want my girls constantly harassed, nor do I want to end up with 10 chickens just to provide him w/ sufficient ladies for his libido.
But I've more or less come to terms w/ it. I have my excellent avian vet looking into the possibilities of having him neutered, am hoping against hope that I lucked out and got a gay rooster, and this past weekend went ahead and tried the introduction again. I figured that introducing him NOW, when he's young and easily intimidated by hens, would be better than waiting until he's bigger and randier.
Clarice is moulting again (she just moulted in July--I have NO idea what's up w/ her), so she's not 100% herself. I decided that might be a GOOD thing, given her aggressive propensities.
So on Sat. a.m. I opened the door between the 2 runs (It's been Audrey and Bianco in one and Clarice and Svetlana in the other for the past month or so) and held my breath. It went well! Here is a longish video of the first 5 min or so:
Clarice is the moulting Barred Rock; Svetlana is red; Audrey is black; Bianco is big and white.
My fave part is around 1:13--Clarice sort of herds the Younguns into the corner and then Svetlana closes the gap! Audrey squeaks out and Bianco turns around, sees Clarice, and SCOOTS out very fast!
This video stays 100% in the new pen (where Audrey and Bianco have been living), but within a few hours B and A had made it into the old pen as well. That night, after Clarice and Svetlana had settled in, I ended up bringing B and A into the big coop myself--they were dithering around the pophole discussing whether it was more dangerous to spend the night outside versus risking Clarice's wrath. Sunday night, they took themselves in by themselves! They didn't jump up to the bottom roost, though, but were settling on the floor so I gave them a boost.
So at least until Bianco's hormones kick in big-time, we seem to be doing OK. Everyone cross your fingers that I have a gay rooster, OK?