Assertion: narwhal's family | /r/HasProperty | delphinidae
Facets:
Source sentences:
text: The Irrawaddy dolphin was once placed in the same family, though recent genetic evidence suggests these dolphins belong to the family Delphinidae.
text: The term dolphin usually refers to the extant families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins),