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Glossary & References / Keywords List / Definitions:

Term to be defined Definition Synonyms & Keywords
Tertials

Click image for "External Appearance of a Duck" Section

 - "Inner flight feathers (secondaries) that differ noticeably in shape and/or color from the immediately adjacent secondaries, often being longer and more pointed."(B8 - waterfowl natural history associated terms)

(See External Appearance of a Typical Duck - Whole body)