Nocturnal (Latin: nox - night, darkness) animals are animals that are mainly active during the night. They hunt or feed during the night, and sleep during the day. Diurnal animals do it the other way around.
Cathemeral animals are equally likely to be awake and active at any time of day or night.
Many nocturnal animals have good night vision. Their large eyes may be highly reflective when a bright light flashes on them. Owls and bats are typical nocturnal predators. More specifically, they have a larger cornea relative to their eye size than diurnal creatures. This increases their visual sensitivity in low-light conditions.
Examples of nocturnal animals change
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