Assertion: warthog's tusk | /r/ObjectUse | used for defense
Facets:
value: against predators
type: PURPOSE
Source sentences:
text: The short, stout, lower tusks are used for defense.
text: The lower tusks, turned razor-sharp by rubbing against the upper tusks, are employed in defense against predators, as well as to dig up their often scarce food and water sources, by Common Warthogs as they roam alone or in groups.
text: The bottom tusks are very sharp and are used for defense against predators.