Bat-eared Fox

About the bat-eared fox

The bat-eared fox is a small African canid, the only living species in its genus, Otocyon. Despite its fox-like build, it isn't genetically a true fox — it sits as the sister species to the tribe that contains foxes and the raccoon dog, and it was once placed in its own subfamily because no clear relationship to any living canid could be established. Fossils of the species date back roughly 300,000 years, found at a site in Kenya, though the genus itself is poorly represented in the fossil record overall.

Its defining feature is named right in the common name: ears that run 11 to 13 cm long, large relative to a body that weighs only 3 to 5.3 kg and stretches 46 to 66 cm from head to body, with a 23- to 34-cm tail. Shoulder height runs 30 to 40 cm. Females are generally larger and heavier than males. The coat is generally tan with grey, agouti-colored guard hairs, pale underparts and throat, and dark limbs shading to black at the paws. The muzzle, the top and tip of the tail, and a mask across the face are black, while the insides of the ears are white. Bat-eared foxes from the eastern African population tend toward a buff coat with dark brown markings, versus the blacker markings of the southern African population.

Those oversized ears do double duty: they help the fox shed excess body heat in a hot climate, and they're a hunting tool, letting it detect insect movement underground. The bat-eared fox occupies two separate populations, one across southern Africa — from Angola through Namibia and Botswana to South Africa, reaching into Mozambique, Zimbabwe, and the Cape — and one across East Africa, from southern Sudan, Ethiopia, and Somalia down through Uganda, Kenya, and into southwestern Tanzania. The two ranges are separated by about 1,000 km (620 mi) of unpopulated territory, though they were likely connected during the Pleistocene. Within its range, the species digs its own dens for shelter from temperature extremes and for raising young, and also shelters under acacia trees during the heat of the day.

Behavior and diet

The bat-eared fox is the only truly insectivorous canid. Harvester termites can make up 80 to 90 percent of its diet, and the species hunts them using its hearing rather than smell or sight — walking slowly with its nose near the ground and ears tilted forward to pinpoint prey moving underground. When that termite species isn't available, the diet broadens to other termites, ants, beetles (including dung beetles), crickets, grasshoppers, millipedes, moths, scorpions, spiders, and occasionally birds, eggs, small rodents, reptiles, and a desert truffle. Berries, seeds, and wild fruit round things out. The fox gets essentially all the water it needs from its food and hasn't been observed drinking from standing water, though lactating females do have a water requirement met the same way.

Groups forage together, often splitting into pairs that move through the same general area, and when termites are abundant, feeding aggregations of up to 15 individuals from different family groups can form. After family groups break up in June or July, and in the months following births, individuals tend to forage alone.

Socially, bat-eared foxes live in pairs or small family groups depending on population — southern African pairs are typically monogamous with pups, while East African groups can include a male and up to three related females. They forage, play, groom, and rest together, and extended allogrooming sessions help hold the group together. Communication runs through visual displays: an erect, forward-facing ear and a high head signal alert interest; ears pulled back against a lowered head signal submission or threat; and the tail arches into an inverted U during dominance displays, aggression, play, or arousal, while it runs straight and low during a chase. Vocal communication is limited to occasional contact and warning calls, mostly in winter.

Reproduction reverses the usual canid pattern: males handle most of the parental care. Gestation lasts 60 to 70 days, and litters run from one to six pups. After a 14- to 15-week lactation period, males take over grooming, defending, huddling, and carrying pups between den sites — and higher male care and den attendance correlate directly with pup survival. Pups disperse from the family group at 5 to 6 months old and reach sexual maturity at 8 to 9 months.

Range and habitat

The bat-eared fox's two populations sit in the arid and semi-arid parts of Southern and East Africa, described above, in home ranges that vary from 0.3 to 3.5 km² (0.12 to 1.35 sq mi). It favors short grasslands, the drier margins of savanna, woodland edges, and open acacia woodland, especially bare ground and areas kept short by grazing ungulates — conditions that suit its termite-hunting style. It will move into taller grass and thicker shrub cover to hide when threatened. Activity patterns shift by region: around the Serengeti in the north, the species is nocturnal roughly 85 percent of the time, while in South Africa it's nocturnal mainly in summer and shifts to daytime activity in winter.

Conservation status

The bat-eared fox is classified as Least Concern by the IUCN. No major threats affect the species as a whole, though hunting, disease, and drought can reduce numbers locally and short-term. Canine distemper, canine parvovirus, and rabies are diseases known to affect the species. Predators include large mammalian carnivores, large raptors, and the Central African rock python, with black-backed jackals posing the greatest risk to pups — adults will mob jackals to drive them off in breeding areas. Some of the fox's range falls within protected areas incidentally. It has some economic value for termite control, since harvester termites are considered agricultural pests, though it has also been hunted for its fur in parts of its range.