Assertion: mallard's speculum | /r/HasProperty | (= distinctive wing patch
Facets:
value: on the wing near the shoulder
type: LOCATION
Source sentences:
text: The breeding male is unmistakable, with a green head, black rear end and a blue speculum (= distinctive wing patch) edged with white, obvious in flight or at rest.
text: It can be distinguished from other ducks, by the distinctive speculum (= a well-defined patch of colored, often iridescent feathers on the wings).
text: The speculum is a distinctive patch of color on the wing near the shoulder, which often helps identify the species.
text: The wings are whitish with black flight feathers below, and from above show a white-bordered green speculum (= distinctive wing patch) and white tertials