Thank you both - I appreciate all the suggestions & comments! I'm actually bringing the older birds, into the bigger coop with the younger birds. I'll attach a pic of the older birds coop. It's a lot smaller and not that great in the winter because not much roof to give them a place to avoid...
I have 2 flocks that I'd like to combine. 1st flock has 10 hens, 1 roo at about 1.5 years old. 2nd flock has 16 hens at about 6 months. Is it doable? Should I do it a few birds at a time or dump em all in one night? They socialize in the yard while free ranging, so they're familiar with each...