Assertion: canvasback's neck | /r/HasProperty | white
Facets:
Source sentences:
text: The head and crest are metallic green and purple, with a white line extending from the base of the bill above the eye and another behind the eye along the crest; the throat and neck are also white.
text: The neck, scapulars, breast, belly and sides are white, and the back and rump are black.