I feel like all we ever talk about here are the integration horror stories, so I thought I'd share a story about the other kind. 
After repeated raccoon attacks last winter, I was down to one pullet and one cockerel, so I sent the pullet to crash with a coworker's flock and gave the cockerel away while I worked on solving my problem. I finally got my "chicken fort Knox" built this spring and started over with chicks. Between a hatchery order, some hatching eggs, and a local BYC member, I have 10 chicks right now: 4 pullets around 11 weeks old, 2 pullets and 1 cockerel around 7 weeks old, and 2 pullets around 5 weeks old. Now that all of those groups are integrated and living in relative peace, it was time to retrieve my hen from my coworker. I figured that, if I had to add a single bird, adding one adult to a flock of chicks would at least be less problematic than one chick to a flock of adults. (No, I didn't quarantine her, and I'm aware of the risks there, but my coworker and I routinely swap/trade birds; this is a calculated risk we've been willing to take.)
And it went fine. Mocha (my EE hen) put the older group of pullets in their places quickly and ignored the smaller pullets completely. She had a few skirmishes with the cockerel, but nothing excessive, and it's probably good that she'll keep him in his place as he matures. I've checked on them multiple times today, and they've been happily scratching around the coop floor together every time.
I've honestly not had any really horrible integration experiences, but this one was by far my easiest. Why can't they all go like this?

After repeated raccoon attacks last winter, I was down to one pullet and one cockerel, so I sent the pullet to crash with a coworker's flock and gave the cockerel away while I worked on solving my problem. I finally got my "chicken fort Knox" built this spring and started over with chicks. Between a hatchery order, some hatching eggs, and a local BYC member, I have 10 chicks right now: 4 pullets around 11 weeks old, 2 pullets and 1 cockerel around 7 weeks old, and 2 pullets around 5 weeks old. Now that all of those groups are integrated and living in relative peace, it was time to retrieve my hen from my coworker. I figured that, if I had to add a single bird, adding one adult to a flock of chicks would at least be less problematic than one chick to a flock of adults. (No, I didn't quarantine her, and I'm aware of the risks there, but my coworker and I routinely swap/trade birds; this is a calculated risk we've been willing to take.)
And it went fine. Mocha (my EE hen) put the older group of pullets in their places quickly and ignored the smaller pullets completely. She had a few skirmishes with the cockerel, but nothing excessive, and it's probably good that she'll keep him in his place as he matures. I've checked on them multiple times today, and they've been happily scratching around the coop floor together every time.
I've honestly not had any really horrible integration experiences, but this one was by far my easiest. Why can't they all go like this?
