Assertion: hummingbird's energy | /r/CapableOf | remain active
Facets:
value: at a time
type: TEMPORAL
value: for more than 12 hours
type: TEMPORAL
Source sentences:
text: All this activity causes them to lose a lot of heat across their body surface, which creates another problem: they are not able to supply their bodies with enough energy to remain active for more than 12 hours at a time.