Which term describes organisms that are active during the night?

The term that describes organisms that are active during the night is "nocturnal." Nocturnal animals have adapted to thrive in low-light conditions, often exhibiting traits such as enhanced night vision, keen senses, and behaviors suited for hunting or foraging after dark. Examples of nocturnal animals include owls, bats, and certain species of rodents.

Diurnal refers to organisms that are active during the day, while crepuscular describes animals that are active during twilight hours, such as dawn and dusk. Seasonal pertains to activities or behaviors that change with the seasons, lacking any specific association with nighttime activity. Therefore, nocturnal is the most accurate term for organisms that operate primarily during nighttime hours.