Hmm. Lots of ideas here! I've thought about getting quail before, but have some concerns about them. There isn't space inside this small house for a large cage, although I do have a (heavy, angle-iron framed) cage in the garage that I use for whoever needs to be isolated. But the garage, though it's attached, isn't heated or insulated, and it can get pretty cold here in the winter (Eastern Oregon). I wasn't sure domestic quail could take the cold? (There are wild quail in the area -- Gambel quail, I think.)
And I've been half in love with Faverolles for a long time -- I think they are so pretty! But I don't remember seeing bantams of them in any of the hatchery catalogs -- where would I find them? I AM concerned about any breed with heavily feathered feet, so I'm not sure about the d'Uccles. We have heavy clay soil and it's wet here in spring and fall. My two Silkie roosters are loose and seem to do fine, but they are hatchery stock and don't have really heavily feathered feet. Maybe I'll have to put a wooden floor in the 'aviary'.
My daughter is autistic and doesn't much like to pet things (though she will pet the cats with the back of her hand), so friendliness isn't really an issue. She just likes to watch the birds (she has goldfish in her room to watch). I can set up this 'aviary' outside of her bedroom window, or I could put it outside the sliding glass door at the back of the house where my grandmother could also watch them (Grandma is 96, DD is 29 and functions on the level of a three-year-old). I'll have to see what Grandma would like. When my large birds are in their tractors and positioned near the sliding glass door, I know she does watch them -- she has an easy chair near the door. Having re-read that, I must add that Grandma is still pretty active considering her age, she doesn't spend all her time sitting! But she is there a lot.
Thanks for all the suggestions.
Kathleen
ETA: the cage in the garage is about four by four by four (it was originally meant to set on top of a pallet). How many bantams could comfortably live in that space? It has a shelf, which adds about two by four feet of extra floor space. And, I have another angle-iron-framed cage sitting outdoors that needs new wire on it (I had chicken wire on it, and last spring a dog tore a hole in it and killed my six Silkie hens). I could put the two cages together, and use the outside one, which is longer and lower, for a run. That would give more space. The outside one is about three feet wide by six or seven feet long, and close to three feet high.