Which term describes animals that are active at dawn and dusk?

The term that describes animals that are active at dawn and dusk is indeed "crepuscular." This term is specifically used to define species that have peak activity periods during the twilight hours of early morning and late evening. Many animals adopt this behavior as it can provide advantages such as evading predators and finding food when the light conditions are more favorable for hunting or foraging.

In contrast, "nocturnal" refers to animals that are primarily active at night, while "diurnal" describes those that are active during the day. "Cathemeral" is a term used for animals that do not have a fixed schedule of activity and may be active at various times throughout the 24-hour cycle, including day and night. Therefore, "crepuscular" is the most precise term for those animals specifically active during dawn and dusk.