Nocturnality is a behavior in some non-human animals characterized by being active during the night and sleeping during the day. The common adjective is nocturnal, with diurnal meaning the opposite.
Owls are well known for being nocturnal, but some owls are active during the day.
The kiwi is a family of nocturnal birds endemic to New Zealand.
The honey badger, a nocturnal animal.
Light pollution on a ski slope in Finland gives the area a hazy, brightened sky.
Owls are birds from the order Strigiformes, which includes over 200 species of mostly solitary and nocturnal birds of prey typified by an upright stance, a large, broad head, binocular vision, binaura
Tawny owl (Strix aluco), left, and western barn owl (Tyto alba), right, belonging respectively to the Strigidae and Tytonidae families
Burrowing owl (Athene cunicularia)
A stamp from the Soviet Union, 1979