Assertion: canvasback | /r/HasProperty | depend on the tubers of wild celery
Facets:
value: traditionally
type: OTHER
value: for food
type: PURPOSE
value: over the winter
type: TEMPORAL
value: during migration
type: TEMPORAL
Source sentences:
text: Canvasback ducks traditionally depended on the tubers of wild celery (Vallisneria americana) for food during migration and over the winter.