Glossary & References / Keywords List / Definitions:

Term to be defined Definition Synonyms & Keywords
Coverts

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- "Feathers that cover the bases of other feathers and usually named for the feathers covered; i.e. secondary coverts over the bases of the secondaries."(B8 - waterfowl natural history associated terms)

(See External Appearance of a Typical Duck - Whole body and Wings for further details on the different types and positions of coverts)