It sounds silly, but the Migratory Bird Treaty that prohibits feather collection is protecting birds and saving lives.
NestWatch Partly Eaten Songbird Egg ID!? 🙁 - NestWatch
Birding: On Collecting Bird Feathers - - The Adirondack Almanack
Collecting Feathers — The Legal Way, by Patrick Kuklinski
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Simple Ways to Preserve Feathers for Crafts: 8 Steps