Assertion: elephant's tusk | /r/HasProperty | extended front tooth
Facets:
value: in most mammals
type: OTHER
Source sentences:
text: The tusk is in fact an extended front tooth.
text: While in most mammals, a tusk is an enlarged canine tooth, an elephant tusk is an enlarged later incisor that grows continuously.
text: The well-known tusks of elephants are actually two enlarged upper teeth that grow throughout their lives.