Assertion: sea otter | /r/CapableOf | keep sea urchins
Facets:
value: in check
type: OTHER
Source sentences:
text: Sea otters are a keystone species, keeping invasive animals like sea urchins in check; now that the otters are disappearing, sea urchins are destroying kelp forests, which in turn means that fish that like to hide in kelp forests have to find new homes.