Assertion: mallard's speculum | /r/CapableOf | edge with white
Facets:
Source sentences:
text: The speculum on about ten of the secondaries is of brilliant changing purple and green, edged with velvet-black and white, the anterior bands of black and white being on the secondary coverts.
text: The Mexican duck is mainly brown, with a blue speculum edged with white, obvious in flight or at rest.