Assertion: young swan | /r/CapableOf | change over to plant-based diet
Facets:
Source sentences:
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.