The Golden Kukri

Introduction

Hong Kong is home to approximately fifty-three native snake species, comprising forty-seven terrestrial and six marine varieties, though source estimates fluctuate between fifty-two and fifty-four. Among these, the bamboo pit viper, Burmese python, Chinese cobra, and elusive king cobra are arguably the most widely recognized.

However, the overwhelming majority of Hong Kong’s native snakes remain completely unknown to the general public. One such inconspicuous species is the golden kukri—also called the ashy kukri or Oligodon cinereus. Significantly smaller than its famous counterparts, this snake is entirely harmless to humans.

Yet, despite its unassuming nature and gentle demeanor, the golden kukri thrives across Hong Kong and vast regions of Asia. While its semi-fossorial lifestyle makes sightings rare, this cryptic reptile plays a vital role in maintaining the region's rich biodiversity.

Description

The golden kukri belongs to the family Colubridae, the largest snake family in the world, spanning over 300 genera and more than 2,000 species. It was first described in 1864 by British zoologist Albert Günther (SBS, 2025; TRD, n.d.) and was given the scientific name Oligodon cinereus cinereus. It is generally understood to be the nominotypical subspecies of the ashy kukri snake (also known as Günther's kukri snake, or Oligodon cinereus), as it represents the typical color pattern within this species complex.

Indeed, unlike the ashy kukri described by Albert Günther—which was based on a single male specimen from Cambodia that displayed a uniform brownish-grey dorsal pattern (Günther, 1864)—the golden kukri features a primarily reddish-brown dorsal coloration.

However, subsequent research indicates that the subspecific status of Oligodon cinereus cinereus (as well as other kukri subspecies) should be disregarded. Instead, it should be reclassified under the single species Oligodon cinereus, as ambiguity remains regarding the precise taxonomy and nomenclature of the genus Oligodon (Smith, 1943; Wagner, 1975; David et al., 2011; Yushchenko, 2023; TRD, n.d.).

First described in 1826 by Austrian zoologist Leopold Fitzinger, the genus Oligodon comprises species that commonly do not exceed 90 centimeters (35 inches) in length. In this regard, the golden kukri is a small snake, even relative to its congeners, reaching a maximum length of only 40 (HKSID, 2018) to 60 centimeters (SBS, 2025) (15.7 to 23.6 inches).

The golden kukri, and the genus Oligodon as a whole, derives its common name from the traditional Nepalese Gurkha kukri knife (alternatively spelled khukuri). This is due to the snakes' enlarged, curved rear teeth, which closely resemble the blade of the weapon (Minton, 1963; HKSID, 2018; SBS, 2025).

Distribution & Habitat

Oligodon cinereus occupies a vast geographical range spanning Northeast India, Southeast Asia—including Thailand (Inger & Colwell, 1977)—southern China, and Taiwan (IUCN, 2026; Yushchenko, 2023; TRD, n.d.). Peninsular Malaysia marks the southernmost limit of its known distribution.

As a strictly terrestrial snake, the golden kukri inhabits both damp and dry open environments, specifically grasslands, shrublands, and woodland edges. Rather than being restricted to a single ecosystem type, Oligodon cinereus is an ecological generalist capable of thriving in highly contrasting habitats.

Consequently, the species frequently adapts to human-altered landscapes, such as the borders of cultivated agricultural fields and fruit plantations where rodent and insect activity is high. The golden kukri also regularly enters concrete stormwater catchwaters (SBS, 2025), drainage culverts, and irrigation canals. Because these deep concrete channels often trap the snakes, herpetologists frequently survey catchwaters to sample and document the species.

In terms of elevation, the golden kukri is typically found at altitudes between 120 and 700 meters (400 to 2,300 feet) (Stuart et al., 2006; SBS, 2025), though it has been documented as high as 1,330 meters (4,360 feet) (IUCN, 2026).

Behavior

The golden kukri is a diurnal reptile, primarily active during the day and at dusk. This non-venomous snake exhibits a generally docile demeanor unless handled, at which point it may defecate as a defensive mechanism. When threatened, it typically coils its body into a tight, defensive spiral (SBS, 2025). Despite lacking venom, it should not be handled; it can inflict deep, painful lacerations using its specialized rear teeth. These wounds often bleed profusely due to a suspected anticoagulant secreted by the Duvernoy's gland—an organ homologous to the venom glands found in vipers and elapids. Notably, this anticoagulation hypothesis is based on observations of Oligodon cyclurus rather than direct studies on Oligodon cinereus (Wüster & Cox, 1992).

As an oviparous species, the female golden kukri typically deposits small clutches of three to five soft-shelled, elongated, and leathery eggs (SBS, 2025). Like those of many terrestrial colubrids, these eggs absorb moisture directly from the surrounding substrate during incubation to sustain the developing embryos.

Mating and oviposition typically synchronize with the late spring and summer months (roughly May to July) across the snake's Indomalayan range. This seasonal timing ensures that the eggs incubate during the warmest, most humid periods of the year, optimizing embryonic development.

Feeding

Most species within the genus Oligodon subsist primarily on reptile and bird eggs, a specialized diet facilitated by their modified, blade-like kukri teeth (Coleman et al., 1993). The golden kukri, however, is a notable exception regarding its dietary habits.

Due to its diminutive size, the golden kukri preys predominantly on small invertebrates, mainly spiders and insects (SBS, 2025). Despite possessing modified teeth, it is not known to consume eggs (HKSID, 2018). Furthermore, unlike other kukri snakes, it does not prey upon small reptiles, amphibians, or rodents. In fact, Oligodon cinereus is one of the very few species within the genus Oligodon to feed almost exclusively on arthropods (Pope, 1935; Savitzky, 1983).

Hong Kong

The golden kukri is one of two kukri species native to Hong Kong (PEB, 2012); the other is the more common Taiwan kukri, Oligodon formosanus (Coleman et al., 1993; AFCD, n.d.). Although the golden kukri is slightly smaller than the Taiwan kukri and features a distinct coloration pattern, the two species can easily be mistaken for one another (HKSID, 2018).

Nevertheless, the golden kukri remains relatively easy to identify among Hong Kong's native snakes due to its unique dorsal coloration. This ranges from orange to reddish-brown, with faint dark banding or irregular mottling running the length of its body. In contrast, its ventral scales are a semi-transparent, pearlescent white to light pink. Its head—which features a shovel-like snout adapted for burrowing—is indistinct from the neck and lacks markings. Furthermore, the species possesses smooth scales and a short, blunt tail that terminates in a spur (HKSID, 2018; SBS, 2025).

While distributed across Hong Kong, the golden kukri is an uncommon sight due to its semi-fossorial lifestyle (HKSID, 2018; SBS, 2025). It has been documented on Hong Kong Island, Lantau Island, and throughout the New Territories (SBS, 2025). However, its presence on the smaller outlying islands has not yet been confirmed. The specimen described above was photographed at the Ngong Ping Viewing Point (昂平觀景台) within Ma On Shan Country Park (馬鞍山郊野公園).

Conservation

The conservation status of the golden kukri was last assessed in 2011 for the IUCN Red List of Threatened Species and is categorized as "Least Concern" (IUCN, 2026; Stuart et al., 2021).

Key factors contributing to this stable conservation status include its extensive geographical range—which spans multiple countries across South and Southeast Asia and covers continuous forest tracts from India to Southern China—and its high adaptability to secondary forests, agricultural edges, and rural plantations. Additionally, its semi-fossorial behavior protects it from many surface-level disturbances, direct human interactions, and predatory pressures.

However, while the golden kukri faces no threat of global extinction, certain populations are subject to localized anthropogenic pressures. Rapid agricultural expansion, commercial logging, and urban development across Indochina and Southern China continue to fragment its woodland and shrubland habitats. Moreover, like many non-venomous snakes, Oligodon cinereus is frequently misidentified as a venomous species due to its defensive posturing—such as coiling up or adopting a flattened striking stance—which often leads to indiscriminate killing when encountered near villages or farms.

Furthermore, as noted previously, golden kukris frequently fall into concrete stormwater catchwaters, irrigation canals, and deep drainage culverts. Unable to scale the smooth concrete walls, trapped individuals face starvation or dehydration unless rescued.

Although the golden kukri is not listed as an endangered species in Hong Kong, capturing or disturbing one is strictly restricted under several overarching legal frameworks. Within the boundaries of designated parks, the Country Parks Ordinance (Cap. 208) explicitly prohibits hunting, catching, capturing, or disturbing any animal or reptile without a special permit issued by the Agriculture, Fisheries and Conservation Department (Hong Kong e-Legislation, 2023). Furthermore, the Wild Animals Protection Ordinance (Cap. 170) categorically bans the hunting or capturing of any wild animals using specific restricted methods across the entire territory of Hong Kong (Hong Kong e-Legislation, 2024).

Conclusion

The golden kukri (Oligodon cinereus) is one of many inconspicuous animal species native to Hong Kong. Although common across most of the territory, very few people have ever heard of it, let alone seen it.

As a rather short snake—even compared to its close relatives—its subfossorial behavior hundreds of meters above sea level means it rarely comes into contact with humans. Interestingly, this secretive lifestyle is precisely what has enabled this small snake to thrive in densely populated Hong Kong, where other species have vanished. Nevertheless, the golden kukri frequently falls victim to human activity, often dying after becoming trapped in catchwaters and irrigation canals.

Although classified as "Least Concern" on the IUCN Red List of Threatened Species, any encounter with a golden kukri should be cherished. It remains a rare sight, both in Hong Kong and across the rest of its geographic range.