Assertion: rhea's feather | /r/HasProperty | black
Facets:
value: mostly
type: DEGREE
Source sentences:
text: A leucistic bird with different colors may show some colors brightly, especially red, orange, or yellow, while feathers that should be brown or black are instead pale or white.
text: The feathers of adult males are mostly black, with white at the ends of the wings and in the tail.