IIRC, squab is domestically raised. I remember it before Cornish game hen became popular.
I also remember when flank steak was inexpensive & when marinated, broiled & sliced across the grain, was delicious.
Christmas dinner was never turkey but a large breed of roasting chicken which came out moist through & through.
Yep...marinated flank steak = LONDON BROIL and was a CHEAP meal once upon a time. It still IS delicious, but now costs almost as much/sometimes as much as Porterhouse steak.
Those very large chickens are CAPONS and what my great Aunt would make/serve at holiday/fancy dinners. I haven't seen them ( though I have seen really big chickens, but they are NOT "CAPONS" ! )in decades.