I have two young* lavender Orpington-based EE hens that are together raising 21 purchased chicks, Black Australorp and black Ameraucana. I can't tell who's who yet. They're ALL BLACK!

(What was I thinking?!?) One of the mamas I call DefComOne because she is a fierce defender and protector, the other I call SweetMom because she is a tender, loving nurturer. The chicks hatched July 1 so that makes them nearly 8 weeks old. Interestingly, when these same two hens co-parented two chicks a few months ago as a test run, they weaned them at about three weeks. They'd hatched those chicks themselves. At four weeks, those two chicks (both cockerels) were roosting in the Big House with the flock. The current chicks (the "Thundering Horde") still sleep nights in the outdoor brooder although as you might imagine they are rapidly outgrowing it. In fact, SweetMom sleeps in the Big House although she spends her days trying to herd or keep up with the Horde.
*just turned a year old as they hatched their cockerel chicks.