Assertion: whistling duck | /r/HasProperty | d. viduata
Facets:
Source sentences:
text: Juvenile D. autumnalis are quite similar to young of the white-faced whistling duck (D. viduata), which have a darker bill and no white wing patch; even when sitting they never seem to show white along the sides, as their thin white vertical barring on the black flanks is very indistinct.