Assertion: penguin | /r/CapableOf | ruffle their feathers
Facets:
value: on a warm day
type: TEMPORAL
value: to break the insulating air layer
type: PURPOSE
Source sentences:
text: Penguins can ruffle their feathers to break up the insulating layer of air next to the skin and release heat.
text: On a warm day, penguins ruffle their feathers to break the insulating air layer, hence cooling down.