Assertion: butterfly | /r/CapableOf | warm up their flight muscles
Facets:
value: by basking in the sun
type: MANNER
value: on colder days
type: TEMPORAL
Source sentences:
text: On colder days, the butterflies have to warm up their flight muscles by basking in the sun.
text: Butterflies are cold blooded and it is necessary for them to warm up their flight muscles.