Assertion: walrus's layer | /r/HasProperty | called blubber
Facets:
Source sentences:
text: Walrus bodies have a thick layer of fat called blubber to keep them warm in the cold Arctic.
text: Thick layers of fat, also known as blubber, keep the animals warm, in addition to dense fur.
text: A thick layer of fat below the skin, called blubber, keeps the walrus warm.
text: They have layers of fat, called blubber, under their skin to help keep warm in freezing weather.