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Hispid hare

The hispid hare (Caprolagus hispidus), also known as the Assam rabbit or bristly rabbit, is a small, endangered lagomorph in the family Leporidae, endemic to the subtropical tall grasslands of South Asia. This species of the monotypic genus Caprolagus is characterized by its coarse, bristly fur—dark brown dorsally with a mix of black and brown hairs, paler brown on the chest, and whitish on the abdomen—short, rounded ears that do not project beyond the fur, a short brown tail, and a robust build with strong claws adapted for digging form mounds rather than burrows. Adults typically measure 38–50 cm in head-body length, with a tail of about 5 cm, hindfoot of 9–10 cm, and weigh 1.8–3.2 kg, making it one of the larger hares in its range despite its secretive nature.^[1] Native to the floodplain grasslands along the southern foothills of the Himalayas, the hispid hare prefers flat, well-drained areas with tall thatch grass up to 3.5 m high, often near riverbanks or marshy zones, where it forages nocturnally on grasses and herbs while using dense cover for concealment. Its historical range extended across northern India (from Uttar Pradesh to Assam), southern Nepal, Bhutan, and Bangladesh, but today it is highly fragmented and restricted to isolated pockets within protected areas, including Manas and Jaldapara in India, Chitwan and Bardia in Nepal, and Royal Manas in Bhutan, at elevations of 75–200 m. The species was rediscovered in Nepal's Chitwan National Park in 2016 after decades of absence, highlighting its elusive status and ongoing decline, with recent studies in 2024–2025 confirming persistence in key sites.^[2]^[3] Classified as Endangered on the IUCN Red List since 1986, with the last assessment in 2020, the hispid hare faces severe threats from habitat destruction through annual grassland burning, overgrazing by livestock, uncontrolled thatch harvesting, agricultural expansion, flooding, and invasive species, leading to an estimated 20–50% population decline since the 1990s and a current global population size of unknown number of mature individuals across its 1,500 km² extent of occurrence. It is protected under CITES Appendix I and national laws, such as Nepal's National Parks and Wildlife Conservation Act of 1973, with conservation efforts focusing on habitat restoration, anti-poaching patrols, and grassland management in protected areas, though challenges like limited funding and human-wildlife conflict persist. Breeding in captivity has seen limited success, with ongoing research emphasizing the need for expanded monitoring and connectivity between fragmented habitats to prevent extinction.^[4]^[5]^[2]

Taxonomy and systematics

Classification history

The hispid hare was first described scientifically as Lepus hispidus by John Thomas Pearson in 1839, based on specimens collected from the base of the Bhutan mountains in Assam, India. This initial classification placed it within the widespread genus Lepus, encompassing various hares and rabbits known at the time.^[6] In 1845, British zoologist Edward Blyth reclassified the species into a new monotypic genus Caprolagus, citing distinct cranial features such as the reduced number of teeth and unique palatal structure that differentiated it from other leporids. Blyth's description emphasized the species' aberrant morphology within the family Leporidae, highlighting its bristly fur and overall primitive characteristics relative to typical rabbits and hares.^[7] This reclassification has been upheld in subsequent taxonomic revisions, confirming Caprolagus hispidus as the sole species in the genus and placing it firmly within the order Lagomorpha.^[8] Phylogenetic analyses have further clarified the evolutionary position of C. hispidus among leporids. Molecular studies using mitochondrial and nuclear DNA indicate that the genus diverged from its closest relatives, including Sylvilagus and Pentalagus, during the late Miocene, with the broader clade separating from other leporids approximately 14.6 million years ago.^[9] Earlier supermatrix analyses supported a similar timeline, estimating the divergence of Asian leporid lineages like Caprolagus around 10–12 million years ago, underscoring its ancient and isolated evolutionary history within the family. No subspecies of C. hispidus are currently recognized, reflecting its genetic uniformity across its fragmented range. Phylogenetic studies confirm the species' distinctiveness.^[9] This aligns with its classification as a relict species, adapted to specialized grassland habitats with limited gene flow due to habitat fragmentation.

Etymology and nomenclature

The scientific name of the hispid hare is Caprolagus hispidus. The species was first described by John Thomas Pearson in 1839 as Lepus hispidus, based on specimens from the Assam region of India, but was later reclassified into its own genus due to distinctive traits such as short ears, a stout body, and non-leporine morphology that differentiated it from typical hares in the genus Lepus.^[10]^[7] In 1845, English zoologist Edward Blyth established the monotypic genus Caprolagus for the species.^[7] The genus name Caprolagus derives from "capro-", referencing a goat-like robust build, combined with "lagus" from the Greek word for hare.^[7] The specific epithet hispidus comes from the Latin term meaning bristly or rough-haired, alluding to the animal's coarse, harsh fur composed of stiff, annulated hairs.^[7] Common English names for the species include hispid hare and bristly rabbit, both emphasizing its distinctive bristly coat, as well as Assam rabbit, named after the type locality in Assam, India.^[5] In Nepal, local names include "Laghukarna Kharayo", where "kharayo" refers to hare and "laghukarna" denotes small-eared.^[11]

Physical characteristics

External description

The hispid hare (Caprolagus hispidus) is a small to medium-sized lagomorph characterized by a head-body length of approximately 480 mm and a short tail measuring about 53 mm. Hindfoot length reaches roughly 98 mm, and adults weigh between 1.8 and 3.2 kg.^[12] Its pelage consists of coarse, bristly guard hairs up to 20 mm long, forming a dark brown dorsal coat intermixed with black and brown hairs; the underparts are brown on the chest transitioning to whitish on the abdomen. The tail is uniformly brown, paler ventrally.^[12]^[13] The head features short, broad ears measuring 54–61 mm, small eyes, and a prominent nasal pad. Limbs are relatively short and stout, with strong hind legs and straight claws.^[13]^[14] Sexual dimorphism is minimal, though females tend to be slightly heavier than males, with mean weights of 2.5 kg for males and 2.8 kg for females (Bell 1987).^[13]

Morphological adaptations

The hispid hare (Caprolagus hispidus) exhibits several morphological traits specialized for survival in the dense, tall grasslands of its native range, where concealment from predators and navigation through abrasive vegetation are critical. Its fur consists of a coarse, bristly outer layer interspersed with black and brownish-white hairs over a finer, brownish-white undercoat, enabling effective camouflage against the earthy tones of grassland undergrowth and offering protection from sharp grasses and potential scrapes during movement.^[14] This bristly texture also aids in reducing visibility to predators like leopards and wild dogs by blending seamlessly with the surrounding thatch.^[15] The compact body form, with short hind legs similar in length to the forelimbs, facilitates low-profile movement through flat, obstructed terrain, minimizing exposure above the grass line.^[14] Adaptations for thermoregulation and predator avoidance further underscore the species' grassland specialization, particularly in the humid, subtropical Terai lowlands. Short, broad ears—shorter than those of the sympatric Indian hare (Lepus nigricollis)—help reduce heat stress by limiting surface area for heat exchange in high-humidity environments while also keeping the animal's silhouette low in dense cover to evade detection.^[14] Small eyes contribute to a limited visual field suited for close-range detection in cluttered habitats rather than long-distance spotting, complementing other senses for overall awareness.^[14] The nasal structure features prominently large nares, enhancing the keen sense of smell essential for foraging and communication in low-visibility conditions; scent glands under the chin and in the groin allow marking of territories and detection of food or threats through olfactory cues.^[14] Locomotor and foraging structures are equally tuned to the grassland niche. Strong, straight claws on all limbs enable the digging of shallow resting forms or "forms" in soft soil, providing quick refuges without the need for extensive burrows, which are impractical in flood-prone riverine grasslands.^[1] The dental formula follows the typical leporid pattern of 2/1, 0/0, 3/2, 3/3, with large, ever-growing incisors and high-crowned molars adapted to grind abrasive, silica-rich grasses and roots that dominate the diet.^[16] These hypsodont teeth continuously erupt to compensate for wear from tough vegetation, ensuring efficient processing of fibrous plant matter in an environment where softer foods are scarce.^[14]

Distribution and habitat

Geographic range

The hispid hare (Caprolagus hispidus) was historically distributed across the Indo-Gangetic and Brahmaputra plains in South Asia, ranging from Uttar Pradesh in central India through the southern Terai region of Nepal and West Bengal to Assam in northeastern India, with extensions into eastern Bhutan and Bangladesh.^[17]^[18] This once-widespread range spanned lowland grasslands along the Himalayan foothills at elevations of 100–250 meters.^[19] Currently, the species occupies a highly fragmented range, confined to isolated pockets of suitable habitat in northern India (primarily Assam, with sporadic records in Uttar Pradesh), the Terai arc of southern Nepal, and eastern Bhutan.^[20] A 2025 study across eight protected areas in the Terai confirmed the highly fragmented distribution, restricted to tall successional grasslands.^[20] Confirmed populations persist in protected areas such as Manas National Park and Barnadi Wildlife Sanctuary in Assam, India; Royal Chitwan, Bardia, and Shuklaphanta National Parks in Nepal; and Royal Manas National Park in Bhutan.^[21] Unconfirmed or historical records exist for sites like D'Ering Wildlife Sanctuary in Assam and Kanha Tiger Reserve in central India, but presence there remains doubtful.^[17] The hispid hare was presumed extinct by the mid-1960s but was rediscovered in 1971 at Barnadi Wildlife Sanctuary in Assam, India, with subsequent confirmations in nearby Manas National Park. In Nepal, initial records date to 1984 in Royal Chitwan National Park, followed by a significant gap until photographic evidence in 2016.^[22] Recent sightings include ongoing detections in Shuklaphanta National Park as part of 2024 monitoring efforts and a direct observation in Pilibhit Tiger Reserve, Uttar Pradesh, India, on November 13, 2024.^[21]^[3] The species' area of occupancy is now estimated at less than 500 km².^[23] Populations have likely been extirpated from Bangladesh and much of central India.^[24]

Habitat preferences

The hispid hare (Caprolagus hispidus) primarily inhabits tall floodplain grasslands in the Terai region of the southern Himalayan foothills, where vegetation exceeds 2 meters in height to provide essential cover from predators.^[17] These habitats are characterized by early-successional grasses, including dominant species such as Saccharum spontaneum, Narenga porphyrocoma, Imperata cylindrica, and Themeda arundinacea, which form dense stands in alluvial floodplains.^[25] The species shows a strong preference for dry savannah grasslands over wet alluvial types, with selection indices indicating up to 64% use of drier areas for their structural stability.^[26] In terms of soil and topography, the hispid hare favors flat, well-drained alluvial soils at low elevations of 100–250 meters, which support the growth of preferred grass species while minimizing flood risk.^[17] It avoids dense forests, steep slopes, and heavily wooded areas, instead utilizing open, thinly forested savannas that maintain grassland integrity.^[25] Microhabitat selection emphasizes dense ground cover (80–100% density) near riverbanks, incorporating reed beds for additional concealment, though direct proximity to water sources is not a significant driver of occupancy.^[17]^[26] Seasonally, the hispid hare demonstrates site fidelity within preferred grasslands but experiences disruptions from annual burning cycles, which temporarily reduce cover and may prompt limited local movements to unburned patches.^[25] Recent species distribution modeling from 2024 reveals that habitat fragmentation has led to over 60% decline in suitable areas across its range, underscoring the precarious nature of these specific preferences amid ongoing landscape changes.^[25]

Behavior and ecology

The hispid hare exhibits crepuscular activity patterns, with peak foraging and movement occurring at dawn and dusk, though individuals in areas with high human disturbance may shift toward nocturnal behavior to avoid detection. During daylight hours, they rest in shallow forms or depressions scraped into the soil beneath tall grassland cover, which provides essential camouflage and protection from diurnal predators. These resting sites are often reused, as evidenced by clustered fecal deposits and thatch cuttings nearby.^[1]^[14]^[27] Hispid hares are predominantly solitary, with individuals typically observed alone except during the breeding season when pairs may form temporarily, as suggested by overlapping home ranges between potential mates. Home ranges are notably small and localized within dense grassland patches, averaging 0.82 hectares for males and 0.28 hectares for females, allowing efficient exploitation of limited resources while minimizing exposure. These ranges are delineated and maintained through scent marking via fecal pellet clusters, which serve both territorial and individual identification purposes; aggression between individuals is rare outside breeding contexts.^[1]^[21]^[27] Communication among hispid hares relies heavily on olfactory cues, with glandular secretions from the chin and groin areas combined with fecal pellets conveying information about identity, reproductive status, and territory boundaries. Auditory signals include thumping of the hind feet against the ground to alert others to potential threats or assert dominance, a behavior common in leporids. Visual and tactile cues play a lesser role due to the dense habitat, but body postures may signal submission or alarm in encounters.^[14]^[28] To counter predation risks, hispid hares employ crypsis by remaining motionless and blending into tall grasses when approached, relying on their camouflaged pelage for concealment. If detected and pursued, they execute rapid zig-zag escapes through dense vegetation, leveraging their agility in confined spaces to disorient predators; this strategy is particularly vital in fragmented grasslands where open flight would increase vulnerability.^[14]^[1]^[28]

Diet and foraging

The hispid hare (Caprolagus hispidus) is strictly herbivorous, subsisting on a diet dominated by grasses, along with shoots, roots, and bark.^[14] Fecal pellet analysis has identified 19 to 23 plant species in its diet across study sites in Nepal, with a marked concentration on tall, early-successional grasses that provide both nutrition and cover.^[29] Primary food items include Saccharum spontaneum (kans grass) and Imperata cylindrica (thatch grass), which occur with the highest frequency in pellets and often comprise over 50% of the diet combined, reflecting selective feeding on their tender shoots and inner cores.^[30]^[29] Other frequently consumed grasses are Desmostachya bipinnata, Cynodon dactylon, and Saccharum munja, with these top five species accounting for more than 85% of overall intake; the composition mirrors availability in preferred habitats, though diversity increases post-fire due to regrowth of young plants.^[29] Foraging occurs primarily at dawn and dusk, involving deliberate cropping of grass at the base followed by stripping of outer sheaths to access nutritious inner tissues, a strategy that targets high-quality, low-fiber portions amid dense vegetation.^[21] This selective grazing favors early-successional stands like elephant grass, minimizing energy expenditure while maximizing nutrient yield from fibrous resources.^[21] Seasonal shifts adapt to environmental changes: during the dry season (November–April), when fires reduce available above-ground forage, the hare relies more on subterranean roots and bark for sustenance, often relocating to marshy riverbanks for residual green growth.^[14]^[21] In the monsoon period, flooded grasslands prompt a move to slightly elevated, forested edges, where it exploits lush herbaceous regrowth.^[21] As a hindgut fermenter, the hispid hare employs cecal microbial digestion to process its high-fiber diet, breaking down cellulose into volatile fatty acids for energy absorption, an adaptation shared among lagomorphs that enables survival on coarse vegetation.^[31] By cropping and selectively consuming grasses, the hispid hare exerts minor influence on grassland dynamics, helping control overgrowth and stimulating regeneration in tropical savannas.^[21]

Reproduction and life cycle

The hispid hare (Caprolagus hispidus) exhibits breeding primarily in late winter, with evidence of pregnant females captured in January and February in western Nepal. Ovulation is induced upon mating, a trait common to lagomorphs.^[13]^[17] Gestation lasts approximately 40 days, during which females prepare surface nests in dense grass cover lined with plant debris and their own fur. Limited data available; observations indicate litter size of 1, with a single fetus observed in a pregnant female and one infant born in captivity. The number of litters per year is unknown. Reproductive biology remains poorly understood, with calls for further research in recent assessments.^[13]^[17]^[21] The young are altricial at birth, furred but blind, and delivered in concealed grass nests; their eyes typically open around day 4. Development is rapid, with weaning occurring at 3-4 weeks of age, after which the juveniles become independent. Sexual maturity is attained at 6-8 months.^[14]^[13] Lifespan in the wild is unknown; individuals do not survive long in captivity. Parental care is limited to the female, who guards the nest and nurses the young briefly each day (about 5 minutes), while males play no role in rearing. Solitary adults pair only briefly for mating before resuming independent lifestyles.^[14]

Conservation

Status and population estimates

The hispid hare (Caprolagus hispidus) is classified as Endangered on the IUCN Red List, a status it has held since 1986, with the most recent assessment conducted in 2019 using criteria A2ac+3c+4ac, indicating an inferred population decline of more than 50% over the past three generations due to continuing habitat loss and degradation.^[4] No updates to this assessment have occurred as of November 2025.^[4] The global population is estimated at fewer than 2,500 mature individuals, with subpopulation estimates in Nepal, such as 200–300 individuals in Shuklaphanta National Park (2019), contributing to the fragmented global total primarily in protected areas of India, Nepal, and Bhutan.^[4]^[32] In Nepal's Terai region, camera trap surveys and pellet group counts from 2024 indicate persistence in areas like Bardia National Park, with earlier 2019 estimates placing 200–300 individuals in Shuklaphanta National Park alone based on density calculations of approximately 5.76 individuals per km² across 41 km² of suitable habitat.^[32]^[33] Overall, populations appear stable in core protected grasslands but are declining elsewhere due to fragmentation.^[4] The species was rediscovered in 1971 in Assam's Barnadi Wildlife Sanctuary after being presumed extinct since the early 20th century, with subsequent sightings confirming isolated populations; recent camera trap records, such as those from Chitwan National Park in 2016 and 2018, highlight ongoing persistence amid habitat challenges.^[34] As of 2025, new sightings in Chitwan National Park and studies on habitat selection across eight protected areas continue to inform conservation strategies.^[3]^[35] Monitoring relies heavily on non-invasive methods like camera traps and fecal pellet surveys to estimate densities and distribution, as the hare's cryptic behavior limits direct observations.^[21]^[17] Legally, the hispid hare is protected under Schedule I of India's Wildlife (Protection) Act, 1972, granting it the highest level of protection, and as a protected priority species under Nepal's National Parks and Wildlife Conservation Act, 1973; it is also listed in Appendix I of the Convention on International Trade in Endangered Species (CITES), prohibiting international commercial trade.^[5]^[11]^[36]

Threats

The primary threat to the hispid hare (Caprolagus hispidus) is habitat loss, primarily driven by the conversion of floodplain grasslands to agriculture, including rice paddies, since the mid-20th century. In the Terai-Duar savanna and grasslands ecoregion, where the species occurs, less than 2% of original grasslands remain intact, with the vast majority transformed into cropland, settlements, and other human uses. This fragmentation has severely restricted the hare's range to isolated protected areas, exacerbating vulnerability to local extinctions.^[37] Grassland management practices further degrade suitable habitat through annual burning and overgrazing by livestock. Uncontrolled fires, often set for thatch collection or to promote new growth, destroy the tall, dense grass cover essential for cover and foraging, particularly during the breeding season from January to March. Overgrazing by domestic cattle compacts soil and prevents grass regeneration, leading to succession into shrubland or woodland that is unsuitable for the species. These activities have contributed to a 20-50% decline in suitable habitat since the 1990s, with ongoing impacts in the Terai Arc Landscape.^[19] Human-wildlife conflict poses additional risks, though poaching remains incidental and opportunistic rather than targeted, often occurring alongside hunting for other species like pigs or deer. Road kills have increased in the Terai region due to expanding infrastructure, such as highways through grassland corridors, fragmenting movement and exposing hares to vehicular traffic.^[38] Climate change is altering flooding patterns in the Terai floodplains, reducing the seasonal regeneration of tall grasses and shifting suitable habitat. Projections under future scenarios indicate a potential loss of over 26% of suitable areas by mid-century, driven by increased variability in precipitation and temperature that disrupts grassland dynamics.^[18] Invasive species, particularly aggressive weeds like Chromolaena odorata in fragmented habitats, compete with native grasses and reduce forage quality, further limiting available cover. Predation pressure has intensified due to habitat loss, which forces hares into open areas more accessible to predators such as golden jackals (Canis aureus) and crested serpent eagles (Spilornis cheela).^[17]

Conservation efforts

Conservation efforts for the hispid hare focus on habitat protection, research, and community involvement across its fragmented range in the Terai grasslands of India, Nepal, and Bhutan. Key protected areas include Manas National Park in India, where the species has been confirmed through surveys, and Chitwan National Park and Shuklaphanta National Park in Nepal, which harbor isolated populations in floodplain grasslands.^[20] These sites provide essential refuges amid ongoing habitat loss, with management practices emphasizing grassland maintenance to support the hare's requirements for dense cover.^[21] The IUCN Species Survival Commission (SSC) Lagomorph Specialist Group plays a central role in coordinating global efforts, producing status reports and action plans that guide surveys and threat mitigation for the species, including the development of a dedicated Hispid Hare working group as of 2024–2025.^[39] In Nepal, broader initiatives under the National Biodiversity Strategy and Action Plan incorporate grassland restoration activities, such as controlled burning and invasive species control, to enhance suitable habitats within protected areas like Shuklaphanta.^[40] Recent research from 2024 to 2025 has utilized camera trapping and habitat modeling in Nepal and India to map distribution and identify optimal conditions, revealing preferences for tall, unburnt grasslands and informing targeted interventions.^[21]^[19] Captive breeding programs have met with limited success; an early attempt in 1987 failed due to challenges in reproduction, and ongoing efforts at facilities like zoos in Assam have not produced viable populations for release.^[17] Reintroduction trials are proposed as a future strategy, contingent on improved breeding protocols and habitat suitability assessments. Community-based programs in the Terai region emphasize education on sustainable fire management to prevent destructive burns that eliminate cover, alongside eco-tourism initiatives in parks like Chitwan to generate funding and awareness for grassland conservation.^[41]^[42] Despite these measures, significant gaps persist, including the need for enhanced cross-border cooperation among India, Nepal, and Bhutan to address transboundary habitat connectivity and threats. Funding shortages also hinder long-term monitoring and research, limiting the scale of restoration and population assessments.^[5]^[43]

References

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Caprolagus hispidus (JT Pearson, 1839) - Plazi TreatmentBank
Jun 8, 2022 · 53 mm, ear c.70 mm, hindfoot c¢.98 mm; weight 1.8-3.2 kg. The Hispid Hare has coarse bristly fur. Dorsal pelage is dark brown, a mixture of ...Missing: morphology | Show results with:morphology
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Distribution and Habitat Preference of Hispid Hare (Caprolagus ...
Aug 6, 2025 · 2024). The distribution of hispid hare within Shuklaphanta has declined significantly over the last decade (Aryal and Yadav 2019), compared ...
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[42]
Mitigating Climate Change in Nepal - Mont Blanc Treks
Jun 17, 2025 · To promote eco-tourism and support conservation ... Hispid Hare and grassland conservation were carried out at eight park entry points.<|control11|><|separator|>
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How regional cooperation can safeguard Asia's biodiversity
Dec 24, 2024 · Protecting Asia's rich biodiversity requires four things: strong cooperation across borders, sufficient funding, active participation by local communities, and ...Missing: Hispid hare gaps