Assertion: mastodon's tusk | /r/CapableOf | evolve as selected characteristic
Facets:
value: probably
type: DEGREE
Source sentences:
text: As with most such structures in the animal kingdom, these tusks probably evolved as a sexually selected characteristic, as five-ton male Mastodons battled one another (and occasionally killed one another) for the right to mate with available females; they would only secondarily have been used to fend off attacks by Saber-Toothed Tigers .Not