Yes, you can definitely move them outside as soon as they have all of their feathers and the fuzz is gone. They recommend keeping a heat lamp available to them until at least 5wks old. Just make sure they'll be safe from cats, dogs, etc. They can probably go into the coop now to get used to it...
Was Welsummer on option on the side of the cage when you bought them?
Ok, maybe Barred Rocks or Cuckoo Marans on the blackish ones (they are kind of similar as chicks).
California Whites on the light yellow ones.
Dark Cornish (a meat chicken) or Easter Egger (it's only an Ameraucana if it's...
The three blackish ones in the picture look to be Barred Rocks. They are great, sweet chickens that lay brown eggs and they are pretty friendly. I have 5 of them. I can't tell if you have cockerels or pullets or a mix of both. Can you post more pictures of the others? Thanks! :) The others are...