Assertion: mallard's speculum | /r/HasProperty | inner trailing wing feathers
Facets:
Source sentences:
text: Male, breeding plumage: Yellowish to greenish to grayish bill; distinctive emerald green neck and head; narrow white collar; rich brown breast; gray to brown back, wings and belly; iridescent blue speculum (inner trailing wing feathers); black rump; black and white tail feathers