Assertion: mallard's speculum | /r/HasProperty | bordered by white
Facets:
value: on each wing
type: LOCATION
Source sentences:
text: Other female dabbling ducks look very similar to the female Mallard, but the Mallard is the only one with a blue speculum bordered by white.
text: It is best recognized by the white-bordered speculum on the wing, which is similar to that of the male.
text: Both male and females have a blue speculum (wing patch) bordered with white on each wing.
text: Both genders also have white tails, white underwings and a blue speculum bordered by white on both sides (patch on the inner wing).The male is distinguished by its iridescent green head and neck, yellow bill, brown chest, and white collar that separate its head and chest colours.