About Procavia capensis (Pallas, 1766)
Characteristics: Rock hyraxes (Procavia capensis) are squat and heavily built. Adults reach 50 cm (20 in) in length and weigh around 4 kg (8.8 lb), with slight sexual dimorphism: males are roughly 10% heavier than females. Their fur is thick and grey-brown, though color varies strongly across different environments: individuals from wetter habitats are dark brown, while desert-living individuals are light gray. Hyrax body size, measured by skull length and humerus diameter, correlates with precipitation, likely due to precipitation’s effect on their preferred forage. A prominent dorsal gland that excretes odor for social communication and territorial marking is apparently unique to hyraxes, and this gland is most clearly visible in dominant males. The rock hyrax has a pointed head, short neck, rounded ears, and long black whiskers on its muzzle. It has a prominent pair of long, pointed tusk-like upper incisors that resemble the incisors of elephants, to which hyraxes are distantly related. Their fore feet are plantigrade, and their hind feet are semi-digitigrade. The soles of their feet have large soft pads kept moist with sweat-like secretions. In males, the testes are permanently located in the abdomen, an anatomical trait that hyraxes share with elephants and sirenians. Thermoregulation in rock hyraxes has been heavily studied, because their body temperature follows a diurnal rhythm. This temperature variation persists even in individuals kept in constant environmental conditions, and this internal rhythm may be linked to water balance regulation. Distribution and geographic variation: The rock hyrax has a wide range across sub-Saharan Africa, split into disjunct northern and southern populations. It is absent from the Congo Basin and Madagascar. Its distribution also includes southern Algeria, Libya, Egypt, and the Middle East, with populations in Israel, Jordan, Lebanon, and the Arabian Peninsula. The northern subspecies has been introduced to Jebel Hafeet, located on the border of Oman and the United Arab Emirates. Pelt shade varies both individually and regionally. In particular, the dorsal patches present in both sexes of central populations are highly variable, ranging from yellow to black, or appearing flecked. In outlying populations, these patches have more consistent color: black in P. c. capensis, cream in P. c. welwitschii, and orange in P. c. ruficeps. A larger, longer-haired population is abundant in the moraines of Mount Kenya’s alpine zone. Ecology and behavior: Rock hyraxes build dwelling holes in any type of rock that provides suitable cavities, including sedimentary rocks and soil. On Mount Kenya, rock hyraxes live in colonies made up of one adult male, several adult females, and immature individuals. They are active during the day, and sometimes active during moonlit nights. The dominant male defends the group, watches over it, and marks his territory. In Africa, hyraxes are preyed on by leopards, Egyptian cobras, puff adders, rock pythons, caracals, wild dogs, hawks, and owls. Verreaux's eagle is a specialist hunter of hyraxes in particular. In the Middle East, the rock hyrax is reportedly rarely hunted by terrestrial predators, since its system of sentries and reliable refuges provide substantial protection. Hyrax remains are almost never found in the droppings of wolves in the Judean Desert. Reproduction: Rock hyraxes give birth to two to four young after a 6–7 month gestation period, which is long for an animal of their size. The young are well developed at birth, with fully opened eyes and a full coat of fur. Young can eat solid food after two weeks and are weaned at 10 weeks. They become sexually mature after 16 months, reach adult size at 3 years, and typically live around 10 years. The weight of male reproductive organs (testes and seminal vesicles) changes with seasonal shifts, tied to sexual activity. In Cape Province, South Africa, males are sexually inactive between May and January. Starting in February, the weight of these organs increases dramatically, and males become able to copulate. Naturopathic use: Rock hyraxes produce large amounts of hyraceum, a sticky mass of dung and urine. This substance has been used as a South African folk remedy to treat several medical disorders, including epilepsy and convulsions. Today, perfumers use hyraceum, tincturing it in alcohol to create a natural animal musk.
