Assertion: hummingbird | /r/HasProperty | one of the few groups of birds
Facets:
Source sentences:
text: Hummingbirds are one of the few groups of birds that go into torpor - a very deep, sleep-like state in which metabolic functions are slowed to a minimum and a very low body temperature is maintained.
text: Hummingbirds are one of the few groups of birds that are known to go into torpor.