Rock Hyrax as an Israeli Stand up comedian

Rock Hyrax as an Israeli Stand up comedian

Rock Hyrax as an Israeli Stand up comedian

Mother hyrax, depressed because there is no law that obliges the father to pay alimony to support so many puppies.

Mother hyrax, depressed because there is no law that obliges the father to pay alimony to support so many puppies.

A hirax trying to be cute, to no avail

A hirax trying to be cute, to no avail

Rock hyrax

Rock hyrax[1]

Rock hyrax (Procavia capensis), Erongo, Namibia

Rock hyrax (Procavia capensis), Erongo, Namibia

At ErongoNamibia
Scientific classificationedit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Hyracoidea
Family: Procaviidae
Genus: Procavia
P. capensis
Binomial name
Procavia capensis

(Pallas, 1766)

Rock Hyrax range

Rock Hyrax range

The rock hyrax (/ˈh.ræks/Procavia capensis), also called dassieCape hyraxrock rabbit, and (in the King James Bibleconey, is a medium-sized terrestrial mammal native to Africa and the Middle East. Commonly referred to in South Africa as the dassie (IPA: [dasiː]Afrikaansklipdassie),[3] it is one of the five living species of the order Hyracoidea, and the only one in the genus Procavia.[1] Rock hyraxes weigh 4–5 kg (8.8–11.0 lb) and have short ears and tail.[3]

Rock hyraxes are found at elevations up to 4,200 m (13,800 ft) above sea level[4] in habitats with rock crevices, allowing them to escape from predators.[4][5] They are the only extant terrestrial afrotherians in the Middle East.[note 1] Hyraxes typically live in groups of 10–80 animals, and forage as a group. They have been reported to use sentries to warn of the approach of predators. Having incomplete thermoregulation, they are most active in the morning and evening, although their activity pattern varies substantially with season and climate.

Over most of its range, the rock hyrax is not endangered, and in some areas is considered a minor pest. In EthiopiaIsrael, and Jordan, it is a reservoir of the leishmaniasis parasite.


Rock hyraxes are squat and heavily built, with adults reaching a length of 50 cm (20 in) and weighing around 4 kg (8.8 lb), with a slight sexual dimorphism, males being about 10% heavier than females. Their fur is thick and grey-brown, although this varies strongly between different environments, from dark brown in wetter habitats, to light gray in desert-living individuals.[7] Hyrax size (as measured by skull length and humerus diameter) is correlated to precipitation, probably because of the effect on preferred hyrax forage.[8]

Prominent in and apparently unique to hyraxes is the dorsal gland, which excretes an odour used for social communication and territorial marking. The gland is most clearly visible in dominant males.[9]

The rock hyrax has a pointed head, short neck, and rounded ears. It has long, black whiskers on its muzzle.[10] The rock hyrax has a prominent pair of long, pointed tusk-like upper incisors, which are reminiscent of the elephant, to which the hyrax is distantly related. The fore feet are plantigrade, and the hind feet are semidigitigrade. The soles of the feet have large, soft pads that are kept moist with sweat-like secretions. In males, the testes are permanently abdominal, another anatomical feature that hyraxes share with elephants and sirenians.[9]

Thermoregulation in rock hyraxes has been subject to much research, as their body temperature varies with a diurnal rhythm. Animals kept in constant environmental conditions also display such variation,[9] and this internal mechanism may be related to water balance regulation.[11]

Distribution and geographic variation

The rock hyrax occurs across sub-Saharan Africa, with the exception of the Congo Basin and Madagascar. The distribution encompasses southern AlgeriaLibyaEgypt, and the Middle East, with populations in Israel, Jordan, Lebanon, and the Arabian Peninsula.[2] The northern subspecies was introduced to Jebel Hafeet, which is on the border of Oman and the United Arab Emirates.[12]

The shade of their pelts varies individually and regionally.[13] In particular, the dorsal patches (present in both sexes) of the central populations are very variable, ranging from yellow to black, or flecked. In outlying populations, these are more constant in colour, black in P. c. capensis, cream in P. c. welwitschii, and orange in P. c. ruficeps.[13] A larger, longer-haired population is abundant in the moraines in the alpine zone of Mount Kenya.[14][15]

The subspecies, which are sometimes elevated to full species, are:[13]

  • P. c. capensis (Pallas, 1766) – Cape rock hyrax, native to South Africa and Namibia
  • P. c. habessinicus (Hemprich and Ehrenberg, 1832) – Ethiopian rock hyrax, native to northeastern Africa and Arabia
  • P. c. johnstoni Thomas, 1894 – black-necked rock hyrax, native to central and East Africa
  • P. c. ruficeps (Hemprich and Ehrenberg, 1832) – red-headed rock hyrax, native to the southern Sahara
  • P. c. welwitschii (Gray, 1868) – Kaokoveld rock hyrax, native to the Kaokoveld of Namibia

An unrelated, convergently evolved mammal of similar habits and appearance is the rock cavy of Brazil.

Ecology and behavior

Rock hyraxes build dwelling holes in any type of rock with suitable cavities, such as sedimentary rocks and soil.[16] In Mount Kenya, rock hyraxes live in colonies comprising an adult male, several adult females, and immatures. They are active during the day, and sometimes during moonlit nights.[17] The dominant male defends and watches over the group. The male also marks his territory.

In Africa, hyraxes are preyed on by leopardsEgyptian cobraspuff addersrock pythonscaracalswild dogshawks, and owls.[18] Verreaux’s eagle in particular is a specialist hunter of hyraxes.[19][20] In Israel, the rock hyrax is reportedly rarely preyed upon by terrestrial predators, as their system of sentries and reliable refuges provide considerable protection. Hyrax remains are almost absent from the droppings of wolves in the Judean Desert.[21]

Feeding and foraging

Hyraxes feed on a wide variety of plant species, including Lobelia[17] and broad-leafed plants.[22] They also have been reported to eat insects and grubs.[10] They forage for food up to about 50 m from their refuge, usually feeding as a group and with one or more acting as sentries from a prominent lookout position. On the approach of danger, the sentries give an alarm call, and the animals quickly retreat to their refuge.[23]

They are able to go for many days without water due to the moisture they obtain through their food, but quickly dehydrate under direct sunlight.[24] Despite their seemingly clumsy build, they are able to climb trees (although not as readily as Heterohyrax), and readily enter residential gardens to feed on the leaves of citrus and other trees.

The rock hyrax also makes a loud, grunting sound while moving its jaws as if chewing, and this behaviour may be a sign of aggression. Some authors have proposed that observation of this behavior by ancient Israelites gave rise to the misconception given in Leviticus 11:4–8 that the hyrax chews the cud,[25] but the hyrax is not a ruminant.[9]


Rock hyraxes give birth to two to four young after a gestation period of 6–7 months (long, for their size). The young are well developed at birth with fully opened eyes and complete pelage. Young can ingest solid food after two weeks and are weaned at 10 weeks. After 16 months, they become sexually mature, they reach adult size at 3 years, and they typically live about 10 years.[9] During seasonal changes, the weight of the male reproductive organs (testes, seminal vesicles) changes due to sexual activity. Between May and January, the males were inactive sexually. From February onward, the weight of these organs increased dramatically, and the males are able to copulate.[26]

Social behavior

Group structure

Hyraxes that live in more “egalitarian” groups, in which social associations are spread more evenly among group members, which survive longer.[27] In addition, hyraxes are the first nonhuman species in which structural balance was described. They follow “the friend of my friend is my friend” rule, and avoid unbalanced social configurations.[28] The balance of social interactions within a group is positively correlated to individual longevity, meaning that “it is not the number or strength of associations that an adult individual has (i.e. centrality) that is important, but the overall configuration of social relationships within the group.”[29] The reason for such a balanced group configuration, rather than one that is centrally dominated by a few individual hyraxes, was suggested to have to do with the fact that information flow to all members is important in a fragmented habitat as that of the hyrax, making a dominance hierarchy a liability for the survival of the group at large.[29]


Captive rock hyraxes make more than 20 different noises and vocal signals.[17] The most familiar one is a high trill, given in response to perceived danger.[10] Rock hyrax calls can provide important biological information, such as size, age, social status, body weight, condition, and hormonal state of the caller, as determined by measuring their call length, patterns, complexity, and frequency.[30] More recently, researchers have found rich syntactic structure and geographical variations in the calls of rock hyraxes, a first in the vocalization of mammalian taxa other than primates, cetaceans, and bats.[31] Higher-ranked males tend to sing more often, and the energetic cost of singing is relatively low.[32] A recent study found that snorts, a rare aspect of male hyrax songs, play an important signalling role as well, with increasing snort harshness being associated with “the progression of inner excitement or aggression”. It is also positively associated with the singing animal’s social status and testosterone levels.[33] Singing has also been shown to be a marker of an individual hyrax’s unique identity, where identity is expressed by unique vocal signatures “that are not condition dependent and are stable over years in singers that did not alter their spatial position.”[34]


The rock hyrax spends roughly 95% of its time resting.[9] During this time, it can often be seen basking in the sun, which sometimes involves “heaping”, where several animals pile on top of each other. This is thought to be an element of its complex thermoregulation.[35]


Male hyraxes have been categorised into four classes: territorial, peripheral, early dispersers, and late dispersers. The territorial males are dominant. Peripheral males are more solitary and sometimes take over a group when the dominant male is missing. Early-dispersing males are juveniles that leave the birth site around 16 to 24 months of age. Late dispersers are also juvenile males, but they leave the birth site much later, around 30 or more months of age.[36]

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