Assertion: black swan's feather | /r/CapableOf | help to trap warm air
Facets:
value: down feathers
type: TRANSITIVE-OBJECT
value: as in penguins
type: OTHER
value: next to the birds body
type: LOCATION
Source sentences:
text: Down feathers – these feathers help to trap warm air next to the birds body as in Penguins who live and cold regions.