We have our first mixed flock of chickens -- now 13 weeks old. On impulse got 3 more that are now 6-7 weeks old. For the past 3 weeks they have been living side by side in the coop and the run - separated by hardware cloth. The way this is rigged up has worked great, but is really a pain to work with and I'd love to merge the flocks this week. The younger 3 are fully feathered out and their voices are no longer like little chicks, but not yet clucks. Considering how long they've lived side by side do you think it's safe to merge them? Oh - and one of the younger 3 has all the hallmarks of a young roo. Many thanks!