Assertion: porcupine | /r/CapableOf | feed on tuber
Facets:
Source sentences:
text: they feed on stems, fruits, leaves, roots, tubers, bark, and other plants.
text: They also eat nuts, tubers, seeds, grass, leaves, fruit and buds.
text: Porcupines feed mainly on roots and tubers, which they dig out with relative ease using their strongly built claws.