Caracals, hyenas and servals attack calves. Servals and caracals have the longest history as human companions. Other mammals of the area include klipspringers, jackals, leopards, spotted hyenas, civets and servals. Hyenas, cheetahs, jackals, servals and bat-eared foxes can also be found in the reserve. Melanistic forms of servals and leopards arise mainly in the highlands. Predators in Kasungu National Park include, hyenas, Cape wild dogs and servals. Their predators include servals, jackals, birds of prey, and common puff adders. Night-time cameras follow rarely seen animals including aardvarks, servals and an African wild cat. Servals occur widely on the plains to the west of the Ngorongoro Crater. Servals are depicted as gifts or traded objects from Nubia in Egyptian art. The association of servals with human beings dates to the time of Ancient Egypt. Servals walk as much as every night. Servals locate prey by their strong sense of hearing. Servals will often use special trails to reach certain hunting areas. Servals might be active for a longer time on cool or rainy days.