Assertion: walrus's tusk | /r/ObjectUse | used for defense
Facets:
value: mainly
type: DEGREE
value: against predators
type: PURPOSE
Source sentences:
text: Both males and females have large tusks that are used for defense, cutting through ice and getting out of the water.
text: Tusks are also used for defense against predators.
text: Tusks are mainly used for defense and attracting female for mating purposes.