This does not account for bantams ~ @ least in my experience. They tend to be laid back & easily handled. Small standards, like Campines & Fayoumis ~ yes, I would agree. Definitely flighty. Super fast. And really good fliers.
Perhaps looking @ breeds that have been meddled with less would help in this regard. Again I can only speak from my experience. The breed standard for Campines always puts flighty right @ the top & everyone I've ever spoken too agrees flighty is definitely a characteristic of this breed ~ so much so I've lost count of the number of times I've been warned about keeping these birds. I have found they mellow with age, & , as you know, mine have been kept with more laid back breeds.
I have always been interested in how closely birds adhere to breed characteristics because it has always been important to me to have as peaceful & stable a tribe as possible. I have got it wrong on occasion. The Vorwerks were a big mistake. I love my Wyandottes but I would never class them as a peace loving chicken. Every single one I've had has been something of a bully, though most have mellowed given time & their ability to place high in the pecking order.
My Japs & D'uccles tend to be people oriented & make really good pets ~ better than silkies imo. Sorry. I'm rambling. Here's some tax.
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