5/3 Roosting with the grown ups. Chicks are 38 and 45 days old.
Taa-dah! Look what I found last evening. Hard to see but there's 3 chicks mashed in that space near the center (to the left of the Salmon Faverolles):
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I did end up interfering because not all the adults were in yet and the 4th chick, Florentine, was pacing the ground in confusion trying to figure out how to get back up and squeeze in between all the fluffy bodies. The simple fact is 8 adults and 4 chicks are an awful tight fit for the top roost, so I picked up Florentine and put her on the lower roost, then moved the 3 other chicks down to join her.
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We checked back later and the 4 chicks stayed down low (but shuffled left), with all 8 adults high. Unfortunately coop cam battery needed recharging so I wasn't able to get a photo of that.
For the next few days I'll prop open the pop door with a brick so the chicks can make an early escape if needed (yes it is a small risk as far as pests and predators, but this is how I've always handled this step).
I consider roosting in the coop the final step of integration, so this will end my "integrate along" though the reality of course is the chicks aren't actually treated as part of the flock until they're closer to point of lay. It took longer to integrate this batch than my previous one but still, not too bad to be back on a normal chicken care schedule only 5 weeks after getting them.