Assertion: trumpeter swan's feather | /r/HasProperty | grey
Facets:
Source sentences:
text: The soft plumage is mainly black, but the feathers of the inner wing are grey.
text: The outer tertial and secondary feathers are gray.
text: Feathers of immature swans are an ash gray color, and some gray feathers remain evident on the heads and necks of swans that are one and two years old.
text: The soft plumage is mainly black, but the feathers of the inner wing are grey.
text: The soft plumage is mainly black, but the feathers of the inner wing are grey.
text: Inner wing feathers are grey, covering lower back and short tail.