Assertion: sea otter | /r/HasProperty | observed using rock
Facets:
value: as an anvil
type: PURPOSE
value: along the shoreline
type: LOCATION
value: as "anvils"
type: MANNER
Source sentences:
text: Sea otters have been known to crack open shells on their chests using rocks as they float on their backs, but they've also been observed using rocks along the shoreline as "anvils" to crack open mussels, clams and crabs.
text: They have been observed using their rock as an anvil to break open shellfish.