Assertion: swan's diet | /r/HasProperty | plant-based
Facets:
value: plant
type: OTHER
value: mainly
type: DEGREE
Source sentences:
text: Swans are generally omnivorous birds, but their diet is mainly plant-based.
text: By the time they are 4 to 6 weeks old, the young swans start changing over to a plant-based diet; and by the time they are 2 to 3 months, their diet is similar to the adults' -- consisting of stems, tubers, leaves and roots of aquatic plants.