Assertion: narwhal | /r/Synonym | the unicornsof the ocean
Facets:
value: because of the long "tusks"
type: CAUSE
value: sometimes
type: TEMPORAL
Source sentences:
text: Narwhals are sometimes known as the "unicorns" of the ocean because of the long "tusks" that protrude from the animals' heads, but scientists have long been stumped about the function of this mysterious appendage — until now.