The Feather Atlas lets you narrow down a feather you’ve found by pattern, color, size, and even which part of the wing it came from, then matches it against real scanned specimens — not an AI guess. The collection is curated by the National Fish and Wildlife Forensics Laboratory, the same lab that identifies feathers in wildlife-crime cases, and covers 438 species of North American birds. It’s free, and has quietly been running since long before feather identification became an app-store trend.