Assertion: hoatzin's wing | /r/HasProperty | black
Facets:
value: with feather
type: OTHER
value: with buff-colored streaks
type: OTHER
Source sentences:
text: The back of the hoatzin is brown, while the wings are brown, red, and black and white striped like the back of the neck.
text: The upperparts (nape, wings, back) are primarily black and dark brown with buff-colored streaks and feather edging on the coverts.
text: Their tails and wings are black.