covert feather
US /ˈkʌvərt ˈfɛðər/
UK /ˈkʌvərt ˈfɛðər/

1.
Deckfeder
Any of the small feathers covering the bases of the larger flight feathers of a bird's wing or tail.
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The bird's beautiful plumage was highlighted by the iridescent covert feathers.
Das wunderschöne Gefieder des Vogels wurde durch die schillernden Deckfedern hervorgehoben.
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Ornithologists often examine the pattern of covert feathers for species identification.
Ornithologen untersuchen oft das Muster der Deckfedern zur Artenbestimmung.