Which term describes animals that are most active at dawn or twilight?

The term that best describes animals that are most active at dawn or twilight is "crepuscular." These animals thrive during the transitional times between day and night, making them most active during the early morning and late evening hours. This behavior allows them to take advantage of lower light levels, which can provide benefits such as decreased predation risk and optimal hunting opportunities for specific prey.

While other terms exist in the context of animal activity patterns, they refer to different behaviors. "Nocturnal" describes animals that are primarily active during the night, and "diurnal" refers to those that are active during the day. "Intermittent" does not specifically relate to a time of day or consistent pattern of activity. Thus, "crepuscular" is the precise term that accurately captures the activity timing of these animals at dawn and twilight.