Assertion: penguin | /r/HasProperty | heavy
Facets:
value: in the world
type: LOCATION
value: because of their thick layer of blubber
type: CAUSE
value: in proportion to their size
type: OTHER
Source sentences:
text: Because of their thick layer of blubber, solid bones and dense plumage, penguins are too heavy in proportion to their size to be able to fly.
text: they are the heaviest penguins in the world.