Assertion: great auk's feather | /r/CapableOf | evolve as heat insulation
Facets:
value: for flight
type: PURPOSE
Source sentences:
text: This leads us to think that feathers evolved first as heat insulation, and only later for flight.
text: This leads us to think that feathers evolved first as heat insulation, and only later for flight.
text: This leads us to think that feathers evolved first as heat insulation and only later for flight.