Assertion: beluga | /r/HasProperty | nicknamed a sea canary
Facets:
value: for a variety of the sounds
type: CAUSE
value: in the 19th century
type: TEMPORAL
Source sentences:
text: For a variety of the sounds they make, in the 19th century the beluga was nicknamed "a sea canary», while in Russia there was an expression "beluga roar" - a characteristic roar of a male during rutting.