Assertion: bald eagle's feather | /r/CapableOf | act as their protection
Facets:
value: against heat
type: PURPOSE
value: against cold
type: PURPOSE
Source sentences:
text: The feathers also act as their protection against heat and cold as they trap layers of air.12.The beak and feathers of American eagles are made of keritan, the same material that makes up human hair and nails.