Assertion: bird | /r/HasProperty | nocturnal
Facets:
Source sentences:
text: Most birds are diurnal, but some birds, such as many species of owls and nightjars, are nocturnal or crepuscular (active during twilight hours), and many coastal waders feed when the tides are appropriate, by day or night.
text: Birds that are awake at night are called nocturnal birds.