Warblers
- Warbler Quick Finders (Princeton University Press)
- Identifying Confusing Fall Warblers: 5 Case Studies (The Afternoon Birder blog)
Falcons/Hawks/Eagles
- Eastern Migrant Raptor Flight Guide
- Raptor Identification Webinar (PDF from Cornell Lab of Ornithology)
- The Identification of North American Accipiters (journal article from American Birds)
- Identification Primer: Accipiters (Carolina Bird Club)
Ducks/Loons
- Ducks at a Distince: A Waterfowl Identification Guide (PDF)
- Duck and Waterfowl Identification Quiz
- Be a Better Birder: Duck and Waterfowl Identification (Cornell Lab of Ornithology quiz)
- Loon ID In Fall And Winter
Shorebirds
- Shorebird Identification (PDF from Pacific Flyway Shorebird Survey)
- Shorebird Identification (PDF from Jason Hoeksema, Delta Wind Birds)
- This Year I Cracked North American Shorebird ID: Find out How! (The Afternoon Birder blog)
- Sassy Shorebird ID Quiz (The Afternoon Birder blog)
- Cornell Label of Ornithology Shorebird Courses
Gulls
- A Second Look at “Seagulls”: Tips for ID (Cornell Lab of Ornithology)
- Stephen Hampton’s Gull Identification Website
- Gull Identification Guide (PDF reference by John Muir Laws)