Assertion: horn shark | /r/CapableOf | feed on sea urchins
Facets:
Source sentences:
text: Large horn sharks that feed mainly on sea urchins (particularly the short-spined purple urchin, Strongylocentrotus purpuratus) have their teeth and fin spines stained purple.
text: When it eats too much sea urchins, teeth of horn shark become purple-colored.