Assertion: trumpeter swan's feather | /r/HasProperty | darker and cleaner gray color
Facets:
value: on trumpeter swan
type: LOCATION
Source sentences:
text: On Trumpeter Swan the feathers are a darker and cleaner gray color, dark enough so that pale feather edges can be detected and often form a faint scaly pattern, and dark shaft streaks may show on some scapulars and wing coverts.