Assertion: trumpeter swan's plumage | /r/HasProperty | stained rusty color
Facets:
value: often
type: TEMPORAL
value: from ferrous minerals
type: OTHER
value: during feeding
type: TEMPORAL
Source sentences:
text: The plumage of adult trumpeter swans is completely white, though their heads and necks are often stained a rusty color from contact with ferrous minerals in the soils of wetland bottoms during feeding.
text: The plumage of adult tundra swans is completely white, though their heads and necks are often stained a rusty color from ferrous minerals encountered in marsh soils during feeding.