Texas Animal Control Officer Practice Test

What term describes animals that are active at twilight or sunrise?

1. Nocturnal

2. Diurnal

3. Crepescular

4. Active

The correct answer is: Crepescular

The term that describes animals that are active at twilight or sunrise is "crepuscular." This behavior refers specifically to those species that are most active during the dawn and dusk hours. Crepuscular animals have adapted to take advantage of the lower light levels during these times, which can offer them advantages in terms of hunting for food or avoiding predators. Many species, such as deer and certain insects, exhibit crepuscular behavior, which allows them to thrive in conditions that balance light and darkness. In contrast, nocturnal animals are primarily active during the night, while diurnal animals are awake and active during the daytime. The term "active" is too vague to accurately describe specific patterns of activity in relation to the time of day. Thus, "crepuscular" is the most precise term for this behavior.