What breeds of gerbils are nocturnal?

Most commonly kept pet gerbils, such as the Mongolian gerbil, are not strictly nocturnal but are more crepuscular, meaning they are most active during dawn and dusk. However, wild gerbils, including species like the fat-tailed gerbil, exhibit nocturnal behavior to avoid daytime heat and predators. Generally, while pet gerbils may be active during the evening, their activity patterns can vary based on their environment and individual temperament.