Owl
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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, binaural hearing, sharp talons, and feathers adapted for silent flight. Exceptions include the diurnal northern hawk-owl and the gregarious burrowing owl.
Owl
Burrowing owl (Athene cunicularia)
Cross-eyed owl
USSR stamp, 1979
Nocturnality
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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", versus 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.