Javan spitting cobra

Identification

The Javan spitting cobra is a large, smooth-scaled cobra that rears up and spreads a hood when threatened^2,4. Most Javan specimens are dark brown above, and the earliest description called it chestnut-brown with a broad head^2,3. Young snakes may show a faint spectacle-like mark on the neck².

Adult females grow larger than males: in a sample of 159 snakes from West Java, adults averaged about 1.18 m (females) and 1.05 m (males) from snout to vent, and the largest was a male of 1.85 m from snout to vent, not counting the tail³. A museum specimen collected on Java around 1820 measures 1.38 m in total length².

Distribution

This cobra is found only in Indonesia: on Java, Bali, Lombok, Sumbawa, Flores, Komodo, Alor and Lomblen¹. An old record from Sulawesi is doubtful, and recent authors do not consider cobras part of that island’s fauna^1,2. Earlier reports from the Malay Peninsula were mistaken¹.

The spitting cobras of Sumatra and Borneo are a separate species, the Sumatran spitting cobra (N. sumatrana)^2,7. WHO notes that this cobra is suspected, but not confirmed, in Timor-Leste⁴.

Habitat

The Javan spitting cobra is abundant in secondary forest and farmland, often close to people³. The West Java snakes in one study came from an area of rice paddies, irrigation canals and fish ponds³. It has also been described as partly arboreal¹.

It copes well with towns: in rescue records from Greater Jakarta in 2015–2019, it was the snake most often found around homes, accounting for 204 of 656 reported encounters (31%)⁵. Snakes were found in kitchens and bathrooms, gardens, chicken coops and rubbish piles⁵.

Behaviour

Like other spitting cobras, it can squeeze venom out of the tips of its fangs as a fine spray aimed at the eyes of a perceived enemy, reaching a metre or more⁴. Its scientific name means “the spitter”: around 1820, a live cobra on Java spat venom when an artist tried to sketch it². Cobras rear up, spread a hood, hiss and strike repeatedly when they feel threatened⁴.

Diet

In rice fields in Central Java, Javan spitting cobras feed mainly on rats and frogs³. Their broad diet is one reason the species copes well with farmland and commercial harvesting³.

Reproduction

The Javan spitting cobra lays eggs¹. In West Java, females carried eggs in September–October and in February, suggesting that they lay during the wet season³. Clutches averaged 14 eggs and ranged from 6 to 23³. Females become mature at about 0.9–1 m from snout to vent³.

Venom and medical significance

The Javan spitting cobra is highly venomous and a significant cause of snakebite, and the World Health Organization places it in its highest category of medical importance on Java and the Lesser Sunda Islands^3,4. About two-thirds of its venom consists of three-finger toxins, including tissue-damaging cytotoxins and short neurotoxins that cause paralysis⁶.

Venom spat into the eyes causes immediate, intense burning pain, heavy watering, swollen eyelids and blurred vision; corneal scarring is known after spits by African spitting cobras but has not been described in Asia⁴.

Indonesia’s only locally made antivenom, Biofarma’s SABU, is raised partly against this species, but laboratory tests found that it neutralises the venom only weakly, especially the paralysing neurotoxins, and a Thai antivenom performed better^4,6,7. Anyone bitten or spat at should go to hospital immediately.

Conservation

The Javan spitting cobra is listed as Least Concern on the IUCN Red List (2012 assessment)⁸. It is harvested commercially for its skin and meat³. A 2026 study concluded that its use of farmland, broad diet, high fecundity and strong venom make it resilient to current levels of harvest³.

Similar species

Rat snakes, including the Indian rat snake (Ptyas mucosa), have small loreal scales between the nostril and the eye, which cobras lack⁴. King cobras, which also live on Java, have a pair of large scales at the back of the head that true cobras do not have⁴. These differences are not a safe basis for handling any snake. Keep your distance from every snake you cannot identify.

In captivity

The Javan spitting cobra is a dangerous venomous snake that can spit venom into the eyes, and it is not suitable as a pet⁴. It should never be caught or kept by private individuals.