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Rock cavy

The rock cavy (Kerodon rupestris), also known as the mocó, is a medium-sized rodent in the family Caviidae, endemic to the rocky outcrops and semi-arid Caatinga biome of northeastern Brazil, where it has been introduced to the island of Fernando de Noronha.^[1]^[2] It features a robust, tailless body adapted for climbing, with a grayish coat mottled in white or black, a white throat, yellowish-white underbelly, and reddish hues on the rump and thighs; adults measure 200–400 mm in length and weigh 900–2,000 g, supported by padded feet and blunt nails for navigating boulders.^[3]^[1]^[2] These herbivores inhabit dry, thorny scrublands near stony hills and mountains, sheltering in rock fissures or burrows and foraging crepuscularly for leaves, buds, flowers, bark, seeds, and occasional fruits, often climbing trees or leaping between rocks to access food.^[3]^[1]^[2] Socially, rock cavies live in hierarchical groups led by a dominant male, communicating through chirps, squeaks, whistles, and tactile grooming while defending territories aggressively, particularly against juveniles; they breed year-round, producing 1–3 precocial offspring after an approximately 75-day gestation, with young reaching maturity in about 133 days.^[3]^[1]^[2] Classified as Least Concern by the IUCN but Vulnerable on Brazil's national red list (as of 2018) due to its stable overall population across a wide range contrasted with localized declines, the species faces threats from habitat fragmentation and hunting for bushmeat, though protected areas help mitigate risks.^[1]^[2]^[4] In captivity, rock cavies can live up to 11 years, compared to 3–4 years in the wild, and their adaptability makes them subjects of study in rodent ecology and placentation.^[3]^[1]

Taxonomy and phylogeny

Taxonomic classification

The rock cavy, scientifically known as Kerodon rupestris (Wied-Neuwied, 1820), is a species of rodent first described by the German naturalist Maximilian zu Wied-Neuwied in his 1820 publication in Isis, based on specimens from the type locality near Rio Grande de Belmonte in Bahia, eastern Brazil.^[5]^[6] Its formal taxonomic classification places it within the following hierarchy:

Taxonomic Rank	Name
Kingdom	Animalia
Phylum	Chordata
Class	Mammalia
Order	Rodentia
Family	Caviidae
Subfamily	Hydrochoerinae
Genus	Kerodon
Species	K. rupestris

No widely recognized synonyms exist for the species, though historical junior synonyms include Kerodon moco Lesson, 1827, and Kerodon sciurens Geoffroy Saint-Hilaire, 1826; in Brazilian Portuguese, it is commonly referred to as "mocó".^[5]^[2]

Phylogenetic relationships

The rock cavy belongs to the genus Kerodon within the family Caviidae and subfamily Hydrochoerinae, where it forms a sister group to the capybaras (Hydrochoerus spp.), with the acrobatic cavy (Kerodon acrobata) representing its closest congener in the genus. This positioning reflects a monophyletic clade characterized by social behaviors and ecological adaptations to diverse habitats, as established through molecular analyses of mitochondrial and nuclear genes. Recent phylogenetic studies, incorporating genomic data, reaffirm the monophyly of the genus Kerodon and its close affinity to Hydrochoerus, highlighting shared evolutionary traits such as harem-based social structures that likely arose after their divergence from other caviids. Genetic evidence from relaxed molecular clock models indicates that the divergence of Hydrochoerinae from other South American cavioid lineages occurred approximately 10–12 million years ago during the middle to late Miocene, coinciding with environmental shifts that promoted diversification in open habitats.^[8] Although the rock cavy exhibits physical similarities to guinea pigs (Cavia spp.) in body form and size, its evolutionary lineage is distinct within Hydrochoerinae. Notably, the rock cavy displays convergent evolution with rock hyraxes (family Procaviidae), unrelated mammals in the clade Afrotheria, driven by adaptation to rocky environments; both taxa have independently evolved morphological features like padded soles for traction on boulders and behavioral traits such as high-pitched whistling calls for predator deterrence, underscoring parallel responses to similar selective pressures despite their phylogenetic distance as true rodents.^[9]

Physical characteristics

Morphology

The rock cavy (Kerodon rupestris) is a medium-sized rodent characterized by a compact, robust body build optimized for navigating rocky environments. Adults typically measure 20 to 40 cm (200 to 400 mm) in head-body length and weigh between 900 and 1,000 g, with males often slightly larger than females.^[1]^[3] This sturdy physique is supported by strong, muscular limbs that facilitate climbing and leaping among boulders, contributing to its agility in rugged terrains.^[3] A distinctive feature is the vestigial tail, which is either absent or reduced to a short stub measuring 1 to 2 cm, lacking the prominence seen in many other rodents.^[1] The overall form resembles that of a guinea pig but with adaptations for terrestrial and arboreal mobility, including short ears and a squirrel-like facial structure.^[3] Internally, the dentition is specialized for a herbivorous diet, following the formula 1/1, 0/0, 1/1, 3/3, for a total of 20 teeth.^[10] The incisors and cheek teeth are hypsodont, meaning they have high crowns and continuously grow to accommodate constant wear from grinding tough vegetation.^[10] The molars feature a simple, prismatic structure with transverse enamel folds that enhance grinding efficiency.^[10] The limbs terminate in padded feet suited for traction on irregular surfaces. The forefeet have four digits, while the hind feet have three, each bearing short, blunt nails except for a small, sharp grooming claw on the lateral digit of the hind foot.^[11]^[3] These padded soles and claw arrangement provide grip during climbing without the fully sharp talons of related species.^[3]

Coloration and adaptations

The rock cavy exhibits a coarse, grayish-brown dorsal coat interspersed with irregular white or black mottling, providing camouflage against the rocky substrates of its habitat.^[12]^[3] The ventral pelage is lighter, typically yellowish-white or tan, complemented by a prominent white throat patch that contrasts sharply with the surrounding fur, and reddish hues on the rump and thighs.^[3]^[1] This coloration pattern aids in blending with the arid, boulder-strewn landscapes of northeastern Brazil, enhancing predator avoidance.^[1] Physical adaptations of the rock cavy are finely tuned to its rupicolous lifestyle in semi-arid rocky terrains. Its hind legs are slightly larger than the forelegs, facilitating agile leaping between boulders during foraging and escape maneuvers.^[12]^[3] The feet feature padded soles and blunt nails—unlike the sharp claws of related species—offering enhanced grip and stability on slick rock surfaces, while a small grooming claw on the outermost digit maintains hygiene.^[3]^[1] These traits enable efficient navigation of granitic outcrops and crevices, where the species seeks shelter from predators and extreme temperatures.^[1] Sexual dimorphism in the rock cavy is minimal, with no pronounced differences in coloration between males and females; males may exhibit slight size advantages in some populations, though overall body mass and length show no significant sexual variation.^[13]^[14]

Distribution and habitat

Geographic range

The rock cavy (Kerodon rupestris) is endemic to eastern Brazil, with its native range spanning from Piauí state southward through Bahia to northern Minas Gerais.^[15]^[1] This distribution is primarily confined to the Caatinga biome in northeastern Brazil, where the species occupies rocky outcrops amid semi-arid landscapes.^[15] The species has been introduced to the Atlantic island of Fernando de Noronha since the 20th century, with four individuals (two males and two females) released between 1967 and 1969 by the Brazilian military as a potential food source.^[16] On the island, the population has proliferated to an estimated 5,473 individuals (95% CI: 3,114–9,622), thriving in predator-free environments with abundant rocky habitats suitable for its ecological needs.^[16] Historically, the rock cavy's range was likely more continuous and extensive before widespread habitat fragmentation in the Caatinga, but no major range contractions have been documented.^[15]^[17] Overall, although the population trend is decreasing, the species is classified as Least Concern by the IUCN, with localized densities reaching up to 12.45 individuals per hectare in optimal areas featuring clustered rock formations; while Least Concern globally, it is considered endangered on Brazil's national red list due to habitat loss and hunting.^[15]^[18]^[17]

Habitat preferences

The rock cavy (Kerodon rupestris) primarily inhabits the semi-arid Caatinga biome of northeastern Brazil, where it occupies rocky outcrops, large granitic boulders, and inselberg formations that dominate the landscape. These rupicolous environments are essential, as the species relies on natural crevices, rifts, and hollows within the rocks for burrowing, shelter, and escape from predators.^[1]^[19] Populations are found at elevations ranging from 20 to 1,200 meters, aligning with the biome's varied topography where mid- to low altitudes offer stable microclimates amid seasonal droughts and irregular rainfall of 400–1,000 mm annually. The rocky terrain not only facilitates predator avoidance but also buffers against extreme temperatures in the arid setting.^[20]^[15]^[1] Associated vegetation includes thorny shrubs, cacti, herbaceous plants, and sparse grasses that provide cover, nesting materials, and food sources such as leaves, buds, and fruits, while the species avoids open grasslands lacking protective rock structures. These plant communities, often forming shrubby savannas or dry thorny thickets, enhance foraging efficiency and concealment in the otherwise exposed semi-arid expanse.^[3]^[19]

Behavior

Rock cavies (Kerodon rupestris) live in stable social groups structured as harems, typically comprising one dominant adult male, three to four adult females, and their offspring, with females and subordinates forming the core of the unit. Observed group sizes average 21 individuals (SE = 0.34) across multiple colonies, though variation occurs depending on habitat quality and resource availability. The dominant male maintains leadership through agonistic interactions, ensuring priority access to mates and resources within the group.^[17] Males display pronounced territorial behavior, defending specific rock outcrops or boulder piles as core territories against intruding adult males to protect the group and mating opportunities. Defense involves aggressive displays and vocalizations, with minimal spatial overlap between adjacent groups, promoting group stability in the rocky Caatinga landscape. Scent marking, common in related caviids, appears absent or rare in rock cavies.^[21] Activity patterns are predominantly crepuscular, with heightened foraging and movement at dawn and dusk to exploit cooler temperatures and reduced predation risk in their semi-arid environment. In regions with lower predator density, individuals may shift toward more diurnal habits, remaining active throughout daylight hours. During midday heat, groups retreat to burrows or rock crevices for rest, emerging again in the evening to minimize thermoregulatory stress.^[22]

Diet and foraging

The rock cavy (Kerodon rupestris) is strictly herbivorous, exhibiting a folivorous diet primarily composed of leaves, supplemented by seeds, fruits, flowers, bark, branches, and sprouts from native Caatinga vegetation.^[23]^[1] Analysis of fecal samples has identified consumption of 23 plant species, with leaves forming the bulk of intake and notable reliance on Bauhinia cheilantha for foliage and Cenostigma pyramidale for flowers.^[23] This generalist feeding strategy reflects adaptations to the nutrient-poor, seasonal environment of the semiarid Caatinga, where the species also practices coprophagy to enhance nutrient extraction from fibrous plant material.^[1] Foraging occurs opportunistically, primarily in the late afternoon or evening, with individuals descending from rocky outcrops to ground level or ascending trees and shrubs to access preferred resources.^[3] As agile scansorial foragers, rock cavies climb vertical rock faces and vegetation up to several meters high, leaping between boulders to navigate their rugged habitat efficiently.^[24]^[3] Seasonal variations in diet are pronounced due to Caatinga precipitation patterns, with greater emphasis on leaves from drought-tolerant species like Bauhinia cheilantha during low-rainfall (dry) periods and increased flower consumption from Cenostigma pyramidale in wetter months.^[23] Trophic niche breadth remains low overall but narrows further in the dry season, when reliance on litterfall resources heightens dietary plasticity without altering core foraging behaviors.^[23] Adapted to arid conditions, rock cavies derive metabolic water from their plant diet, exhibiting minimal dependence on external sources through low evaporative water loss and efficient renal function typical of semiarid rodents.

Communication

Rock cavies (Kerodon rupestris) employ a multimodal communication system primarily involving vocalizations, visual posturing, and tactile interactions to convey information about threats, social status, and group cohesion.^[1] These mechanisms are adapted to their rocky, semi-arid habitats where close proximity in colonies facilitates direct signaling.^[1] Vocalizations form a key component of rock cavy communication, with adults producing up to 13 distinct call types that serve functions such as maintaining contact, regulating social interactions, and signaling danger.^[25] Low-frequency tonal calls, including slow whistles and tweets, function as contact signals within groups to promote cohesion during foraging or movement.^[25] Alarm calls, particularly whistles, are modulated based on threat urgency; slower variants indicate distant predators, while faster, higher-pitched forms signal immediate dangers, allowing colony members to adjust their escape responses accordingly. Other alarm-related vocalizations include drrr calls and drumming sounds, often associated with intimidation or warning.^[25] Visual signals in rock cavies rely on body postures and movements to assert dominance and resolve conflicts, as individuals frequently interact in confined rock pile environments.^[1] Dominant males display erect postures, head thrusts, and chases to establish hierarchy and defend territories, with subordinates adopting submissive stances to avoid escalation.^[1] Tactile communication reinforces social bonds and mediates aggression through physical contact. Allogrooming is prevalent among males, with the dominant individual receiving the most attention, which helps maintain alliances within the group; female and intersexual grooming occurs less frequently.^[1] In conflicts, aggressive nips and bites accompany chases, serving to enforce rank without severe injury.^[1] Face nuzzling and crawling over one another further strengthen affiliative relationships in close-knit colonies.^[1]

Reproduction and parental care

Mating system and reproduction

The rock cavy (Kerodon rupestris) exhibits a polygynous mating system characterized by resource-defense polygyny, in which dominant males defend rock crevices and dens to monopolize access to groups of females, mating more frequently with them than subordinate males.^[1] Breeding occurs year-round under optimal conditions but peaks during the rainy season, with females typically producing up to 3 litters annually due to postpartum estrus, with breeding intervals allowing multiple pregnancies per year.^[1]^[26] Gestation lasts approximately 75–76 days, after which females give birth to litters of 1–3 precocial young that are born fully furred with eyes open.^[1]^[3] Individuals reach sexual maturity at around 4 months (133 days) of age, with individuals attaining a body mass of 700–1,000 g by 6 months.^[1]

Development and parental investment

Rock cavy young are highly precocial, born fully furred with open eyes and capable of walking within 1-2 hours after birth. They begin consuming solid food as early as 2 days after birth and are typically weaned around 35 days of age, although they remain integrated into the family group for several additional months to leverage collective protection and social learning.^[27]^[1] Parental investment is biparental, with both sexes actively guarding offspring from predators and conspecific intruders by maintaining vigilance at rock crevices and emitting alarm calls. Females primarily nurse the young for up to 30 days, while males contribute through huddling, grooming, and occasional retrieval of wandering pups, enhancing overall pup security in the arid environment. In the absence of a male partner, single mothers display heightened aggression toward potential threats, compensating for reduced paternal input to protect their litters.^[28]^[27] Offspring growth is rapid, with individuals attaining adult body size of approximately 700-1000 g by 6 months of age, supported by a diet transitioning from milk to vegetation. This swift maturation, combined with the species' reliance on rocky refuges for concealment, contributes to relatively high juvenile survival rates in the semi-arid caatinga habitat.^[1]

Conservation status

Threats

The rock cavy (Kerodon rupestris) faces several anthropogenic and environmental threats across its range in the Caatinga biome of northeastern Brazil, contributing to localized population declines despite its overall classification as Least Concern by the IUCN. Primary risks include habitat degradation and direct human exploitation, which have reduced suitable rocky outcrops essential for shelter and foraging. These pressures are exacerbated by the species' dependence on specific semiarid landscapes, where fragmentation limits dispersal and increases vulnerability.^[15] Habitat loss is a major ongoing threat, driven by deforestation in the Caatinga for agriculture expansion and charcoal production, which has intensified since the early 2000s and diminished the availability of granitic boulder formations used as refuges. This conversion of dry forests and shrublands to farmland and fuel sources has affected the availability of suitable habitats for the rock cavy, further compounded by soil degradation and vegetation clearance.^[29] Hunting poses a significant direct threat, with local communities targeting rock cavies for subsistence and commercial meat, contributing to population declines in certain regions. Traditional methods, such as stone traps, are commonly employed in semiarid areas, amplifying pressure on this endemic rodent.^[30] Predation risks have increased due to habitat fragmentation, which facilitates encounters with domestic dogs and cats, particularly in altered landscapes near human settlements. On the introduced population at Fernando de Noronha Archipelago, free-roaming cats prey on rock cavies, contributing to higher mortality among juveniles and disrupting local dynamics.^[31]^[32] Additionally, climate change intensifies droughts in the Caatinga, reducing vegetation cover and food availability, while expanding road infrastructure heightens roadkill incidents for this ground-dwelling species.

Protection and management

The rock cavy (Kerodon rupestris) is classified as Least Concern on the IUCN Red List, with the assessment from 2016 indicating a stable population trend due to its extensive range across the Caatinga biome and high adaptability to rocky habitats (unchanged as of 2023). In Brazil, however, it is listed as Vulnerable by the Chico Mendes Institute for Conservation of Biodiversity (ICMBio) owing to localized declines from habitat fragmentation and hunting.^[24]^[6] The species inhabits several protected areas in northeastern Brazil, including Chapada Diamantina National Park in Bahia, where populations are monitored by ICMBio to support biodiversity conservation efforts. These reserves help mitigate impacts from habitat threats like deforestation by preserving essential rocky outcrops.^[33]^[34] Management strategies include captive breeding programs at facilities such as the Center for Breeding of Wild Animals in Mossoró, Rio Grande do Norte, for research and conservation purposes.^[35] Research efforts focus on population genetics, with studies revealing chromosomal variations across Caatinga regions that inform connectivity and conservation priorities.^[36] Additionally, investigations into the introduced population on Fernando de Noronha Archipelago assess genetic diversity and potential invasiveness, using density estimates to guide management of this non-native group.^[37]

References

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### Rock Cavy Summary
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Insufficient relevant content. The provided URL (https://www.iucnredlist.org/species/10988/22190269) does not contain specific details about *Kerodon rupestris* conservation status, population, threats, or habitat in the visible text. The page includes a feedback form and a link to contact IUCN, but no substantive species information is present in the excerpt.
[16]
None
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[17]
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The eye of the crepuscular rodent rock cavy (Kerodon rupestris ...
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Its local name is the mocó. It belongs to the same family as the guinea pig (Caviidae), but although similar in size to the guinea pig, it differs in general ...
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Population density and use of space by Kerodon rupestris
It should be noted that the only modelled species threatened with extinction is the endemic rock cavy Kerodon rupestris (known as 'mocó'), which is in the ...<|control11|><|separator|>
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Physical characteristics: Rock cavies are about the same size or slightly larger than the common guinea pig, 11.8 to 15.7 inches (30 to 40 centimeters) long ...Missing: tail limbs
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[34]
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[36]
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