I love this mind setWe have a coop attached to a run that the birds are in most of the time - they only free range on a limited basis as we have a large number of neighborhood dogs that are not kept confined/at home and our current property is small with occupied properties very close. My previous flock free ranged most of the time with only being confined to the run as needed because our location then was a large property surrounded by crop fields with the nearest occupied property being 1/2 mile away. Can't say I've spent any time chasing chicks in either setup.
I've had broodies take that have taken their babies right out with the rest of the flock as soon as they left the nest after hatching and I've had broodies who keep to themselves for a few days after. This last time around (my first hatching in many years, so I had forgotten how little worry is really needed) I did have them sectioned off within the main coop for the first three days or so - then realized that I was having to put a lot more work into this whole thing than I remembered ever doing with previous hatches and realized that was the only difference - I had created work and worry for myself by trying to maintain them in their own section of things. Most of the worry/panic in these situations is, indeed, unique to the human component of the whole affair. Babies may wander a bit far afield from mama now and then but one or the other will call out and a family reunion takes place - have yet to have anyone get separated and unable to get back together on their own. My babies have never had an issue going up and down ramps, etc. with their mother - she goes, they follow - if they don't figure it out right off they call out and she comes back for a one-on-one lesson on how to navigate that particular obstacle.
The flock gives them their space - more often than a flock member intruding on the chicks it is the chicks that wander a bit away from their mother and invade the space of a flock member. At those times, the older chicken gives the chick a deserved reminder of the courtesies of chicken society and the chick runs back to mama. If/when mama feels someone is being overly aggressive about the lessons of chick manners, she will step in - but she is also a good judge of when her little ones are out of line (wouldn't it be nice if the same were true of humans) and will let the lessons be given.
I honestly, in all my years and multiple hatches, can't think of a single chick I've lost - in fact, quite the opposite, my broody raised chicks that are allowed to just "be chickens" from day one are generally healthier, grow better and come along all around more vigorously. I have not once had a situation where a flock member injured or killed a chick, where a chick just got hopelessly lost and died, etc.
