StepBackInTime says:
"My partner just told me that they think it is only feathers of birds of prey, hawks, eagles, owls, etc. that are illegal but check anyway."
Absolutely NOT. Its all songbirds and water fowl, and actually most birds period. Even if you find a molted feather on your lawn...you cannot use it. Let me go find the law for you.
All I can say, is any not commercially raised fowl...the feathers cannot be used...turkey, chicken pheasant, guniea hen, peacock are some you can use.
Migratory ducks & geese, sea gulls, song birds, raptors, hawks, owls, even crow...are some you canNOT use.
The pretty mallard or cananda goose molted feather you found on your lawn? forget it. the feathers from the songbird who smashed into your window? Nope. you cannot use them. the downy feathers left in the nest you clean out in autumn? Nope.