Hedgehog

The four-toed hedgehog, widely known as the African pygmy hedgehog, lives across central and eastern Africa from Gambia and Senegal to Somalia and south to Mozambique, favouring grassy savannah, cropland and open woodland. It is about 21 cm long and weighs 250 to 600 grams, and unlike related species it usually has only four toes on each hind foot. A solitary, nocturnal animal, it can cover miles in a night hunting insects, grubs, snails and spiders, and it has been recorded eating scorpions and venomous snakes. When threatened, it rolls into a spiny ball.

About the hedgehog

The animal covered here is the four-toed hedgehog (Atelerix albiventris), also widely known as the African pygmy hedgehog, a species found throughout much of central and eastern Africa. Its populations are scattered across suitable savannah or cropland habitats, and it avoids forested areas. The common name comes from a genuine feature: unlike related hedgehog species, it typically has only four toes on each hind foot, lacking the hallux, though some individuals show a small bony lump or even a well-developed toe in that spot.

The species has an oval body about 210 millimeters (8.3 in) long and weighs between 250 and 600 grams (8.8–21.2 oz), with females typically larger than males. It has short legs, a short tail around 2.5 centimeters (0.98 in) long, a long nose, and small beady eyes, along with relatively large ears and whiskers that suggest sharp senses. Coloration varies, but wild specimens typically have brown or grey spines tipped in white or cream, speckled grey fur on the body, brown fur around the muzzle, and a white face, legs, and underside. The spines covering the upper body range from 0.5 to 1.7 centimeters (0.2–0.67 in) long, longest on top of the head, and each spine always has a white base and tip regardless of its overall color. Males have an externally visible penis positioned mid-abdomen, with testicles recessed into pouches near the anus, and females may have anywhere from two to five pairs of teats.

The four-toed hedgehog ranges from Gambia and Senegal in the west to Somalia in the east, and south into eastern Africa as far as Mozambique. It favors grassy environments or open woodland and can be found at elevations up to 2,000 meters (6,600 ft), though it is more common at lower elevations, sheltering in dry, rocky, or grassy areas rather than dense forest or swampland.

Behavior and diet

The four-toed hedgehog is solitary and nocturnal. It moves mostly along the ground but can climb and swim when needed, and it is highly energetic, sometimes covering miles in a single night while foraging for insects, grubs, snails, spiders, some plant matter, and occasionally small vertebrates. It has an unusually high tolerance for toxins and has been recorded eating scorpions and even venomous snakes. Common sounds include snorts, hisses, and a quiet twittering; when attacked it can scream loudly, and males give a birdlike call during courtship.

Its main defense against predators — which in the wild include Verreaux's eagle-owl, jackals, hyenas, and honey badgers — is to tense the muscles along its back so the spines stand erect, then roll into a tight ball that protects its limbs and head. If a predator persists, the hedgehog twitches to jab its spines into the attacker while making snuffling or grunting noises; unlike a porcupine, it does not release its quills into an attacker's skin, and heavy quill loss in an adult usually signals a health problem rather than a defense mechanism. When introduced to a new or particularly strong smell, the species also sometimes performs "self-anointing," working the substance into a foamy lather with its saliva and spreading it over its spines; the purpose is poorly understood but is thought to be defensive, since hedgehogs have been known to self-anoint using poisonous toads. It prefers temperatures between 24 and 30°C (75–86°F); in hotter conditions it shelters in a burrow and estivates, and in colder conditions it hibernates to conserve energy, though estivation appears tied more to food scarcity than heat itself and rarely lasts more than six weeks.

Females are fertile year-round, without a fixed breeding season, though mating peaks during the rainy season when food is more abundant. Males court females with high-pitched vocalizations, and ovulation is induced, occurring only after mating, usually within 24 hours. A female typically gives birth to one litter a year, most often four or five hoglets, though litters can range from two to ten. Gestation lasts 30 to 40 days, and the mother gives birth in a lined nest cavity such as an abandoned rodent burrow. Newborns weigh about 10 grams (0.35 oz), are blind and helpless, and are born with soft spines under a thin protective membrane that recedes as the spines stiffen within hours. The eyes open at fifteen days, deciduous teeth appear around three weeks, and permanent teeth follow at seven to nine weeks. Young are weaned by six weeks and can reach sexual maturity at two to three months old, though wild hoglets typically do not breed in their first year.

Range and habitat

The four-toed hedgehog is found across a broad swath of central Africa, from Gambia and Senegal in the west to Somalia in the east, and in eastern Africa as far south as Mozambique. It prefers grassy environments and open woodland and can occur at elevations up to 2,000 meters (6,600 ft), though it is more commonly found in lowland areas. Because it needs dry, rocky, or grassy shelter, it avoids dense forest and swampland, and its populations tend to be scattered between patches of suitable savannah or cropland habitat rather than continuously distributed.

Conservation status

The four-toed hedgehog is rated Least Concern (LC) by the IUCN, reflecting its extensive range and stable wild population. No specific threats or conservation programs are named here beyond its natural predators — Verreaux's eagle-owl, jackals, hyenas, and honey badgers. The species is also a popular small pet around the world and has been bred successfully in captivity for the exotic pet trade, including for color and temperament in competitive hedgehog shows, which has reduced the need to import animals from the wild. Some U.S. and Canadian localities restrict or ban ownership of the species, in part due to its potential to carry foot and mouth disease, a highly contagious illness affecting cloven-hooved animals.