Assertion: hummingbird | /r/CapableOf | visit at least 1,500 flowers
Facets:
value: in search of nectar
type: PURPOSE
value: because of their great expenditure of energy
type: CAUSE
value: a day
type: TEMPORAL
Source sentences:
text: A hummingbird has to visit at least 1,500 flowers a day in search of nectar because of their great expenditure of energy to stay warm and maintain their heart rate.