Assertion: sea urchin's predator | /r/HasProperty | sea star
Facets:
Source sentences:
text: Some predators of sea urchins are: sea star, trigger fish, crabs, otters, also humans.
text: Starting between three and four years ago, the region’s population of purple sea urchins – which eat marine vegetation – exploded after a disease wiped out their main predators, sea stars.