Which feature distinguishes nocturnal animals from other animals?

Nocturnal animals are specifically defined by their activity patterns, which primarily take place at night. This adaptation allows them to hunt, forage, and carry out social interactions when it's dark, often avoiding predation from diurnal (day-active) animals and benefiting from the reduced competition for resources. The physiological and behavioral traits that nocturnal animals possess, such as enhanced night vision, a heightened sense of hearing, and specialized hunting techniques, are all geared toward maximizing their efficiency during these nighttime hours.

The other options refer to different patterns of activity that do not specifically relate to nocturnal behavior. For example, being active during the daytime is characteristic of diurnal animals, hibernating during the day applies to some species that are inactive in response to adverse conditions, and being active at twilight (crepuscular behavior) is distinct from true nocturnality since it occurs during dawn and dusk rather than the full night.