di·ur·nal / die.er.nal
adjective – in animals: being mostly active in the daytime; in plants and flowers: blooming in the daytime and closed at night
related forms of diurnal: diurnally (adverb)
diurnal in a sentence: Hummingbirds are diurnal because they are most active in the day
examples of diurnal in nature: bearded dragon, ostrich, emerald tree boas, chimpanzees, long-tailed pangolins
see also: nocturnal, crepuscular