K
Species Profile

King Cobra

Ophiophagus hannah

Snake-eater, nest-builder, giant of Asia
CappaPhoto/Shutterstock.com

King Cobra Distribution

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Found in 14 countries

At a Glance

Wild Species
Also Known As Hamadryad, King of snakes
Diet Carnivore
Activity Diurnal+
Lifespan 15 years
Weight 12 lbs
Status Vulnerable
Did You Know?

Not a "true cobra": it's genus Ophiophagus (not Naja).

Scientific Classification

The king cobra (Ophiophagus hannah) is the world’s longest venomous snake and is distinct from “true cobras” (genus Naja). It is noted for its ability to raise a large portion of its body, spread a hood, and for its specialized diet that includes other snakes.

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Elapidae
Genus
Ophiophagus
Species
Ophiophagus hannah

Distinguishing Features

  • Exceptionally long venomous snake; adults commonly several meters in length
  • Genus Ophiophagus (“snake-eater”): diet often dominated by other snakes
  • Hood is present but typically narrower/less broad than many Naja cobras; throat/neck often shows distinctive banding in some populations
  • Unique among many snakes for notable nest-building and egg-guarding behavior by females
  • Elapid with fixed front fangs; potent neurotoxic venom with large delivered volume

Physical Measurements

Males and females differ in size

Length
♂ 12 ft 2 in (9 ft 10 in – 18 ft 1 in)
♀ 10 ft 6 in (8 ft 10 in – 12 ft 6 in)
Weight
♂ 18 lbs (11 lbs – 26 lbs)
♀ 10 lbs (7 lbs – 13 lbs)
Tail Length
♂ 2 ft 4 in (1 ft 8 in – 3 ft 3 in)
Top Speed
4 mph
slithering
Venomous

Appearance

Primary Colors
Brown Green Black
Secondary Colors
Yellow Cream Striped
Skin Type Dry keratinized scales; dorsal scales typically smooth and glossy (not strongly keeled), with an expandable hood formed by elongated cervical ribs.
Distinctive Features
  • World's longest venomous snake: maximum reliably measured total length 5.85 m (Peninsular Malaysia; Whitaker & Captain, 2004).
  • Adult size commonly ~3-4 m total length; body long and relatively slender compared with heavy-bodied pythons.
  • Not a 'true cobra' (genus Naja): species is Ophiophagus hannah (family Elapidae) with a narrower, longer hood.
  • Hood display: raises anterior body and spreads hood; often accompanied by low-frequency growl-like hiss.
  • Head large with distinct canthus; eyes relatively large; throat frequently yellow to cream when expanded.
  • Scalation commonly reported as 15 dorsal scale rows at midbody; ventrals typically ~235-250; subcaudals ~83-96 (range varies by source/population).
  • Geographic range: South and Southeast Asia (e.g., India through Indochina to southern China and the Malay Archipelago).
  • Ecology: ophiophagous apex predator specializing on other snakes (also takes lizards occasionally).
  • Reproduction: builds leaf-litter nest; female guards clutch (commonly ~20-40 eggs) until hatching.
  • Medical relevance: high venom yield (often cited ~200-500 mg dry venom per bite) makes envenomation potentially fatal without antivenom; bites are typically defensive and context-dependent.
  • Adult hood lacks the classic 'spectacle' mark typical of many Naja; pattern instead tends toward chevrons/bands.

Sexual Dimorphism

Males average larger and longer-tailed than females, reaching greater maximum lengths. Females are typically shorter-bodied but become conspicuously robust when gravid and are the sex that nest-builds and guards the clutch.

♂
  • Typically longer total length and proportionally longer tail (more subcaudal vertebrae).
  • Often slimmer-bodied at the same length compared with gravid females.
♀
  • Typically shorter maximum length than males in most field reports.
  • Gravid females show pronounced mid-body girth increase.
  • Nest-building and egg-guarding behavior during incubation.

Did You Know?

Not a "true cobra": it's genus Ophiophagus (not Naja).

Longest confirmed venomous snake: recorded to 5.85 m.

Name meaning: Ophiophagus = "snake-eater," reflecting its ophiophagous diet.

One of the very few snakes that builds a nest; the female guards it until hatching.

Can raise a large portion of its body to deliver a towering threat display-often lifting ~1/3 of its length.

Produces a distinctive low, growl-like hiss (lower frequency than many snakes), used in threat displays.

Venom yield can be very large (often cited on the order of hundreds of milligrams per bite), making bites medically severe despite venom being less potent than some smaller elapids.

Unique Adaptations

  • Specialized snake-eating ecology: a skull/jaw system and feeding behavior well-suited to subduing long, muscular prey (other snakes) and swallowing them efficiently.
  • High venom output + efficient delivery: fixed front fangs and large venom glands enable delivery of large venom volumes-key for quickly immobilizing large, potentially dangerous prey.
  • Hood mechanism: elongated cervical ribs flare the neck into a hood, enhancing apparent size and signaling during defense.
  • Enhanced "upright" threat posture: strong axial musculature allows extended lifting of the forebody for intimidation and better strike positioning.
  • Low-frequency hiss: produces a deeper, growl-like exhalation compared with many snakes, which may be more startling to large animals.
  • Egg-nest microclimate control (behavioral adaptation): the mound of decomposing vegetation can help buffer temperature and humidity around developing eggs.

Interesting Behaviors

  • Ophiophagy and selective hunting: actively tracks other snakes (including rat snakes, kraits, and sometimes other king cobras), using tongue-flicking and chemical trails to locate prey.
  • Towering defensive display: raises head and forebody, spreads a narrow hood, fixes gaze on the threat, and may "track" a moving intruder while upright before striking.
  • Nest construction and maternal guarding: females scrape and pile leaf litter into a mound nest, lay eggs inside, and guard aggressively until shortly before hatching.
  • Male-male combat: during breeding season, males may wrestle upright, attempting to pin the opponent's head/neck to the ground.
  • Broad-habitat ranging: moves through forest, bamboo thickets, plantations, and forest edges; frequently uses cover (logs, burrows) and may be crepuscular where disturbed.
  • Risk management around humans: often avoids conflict if given escape routes, but becomes highly dangerous when cornered, handled, or when a nest is nearby.

Cultural Significance

The king cobra (Ophiophagus hannah) in South and Southeast Asia is a symbol of protection, power, and the border between wild and human worlds. It links to Hindu, Buddhist, and local snake beliefs and appears in temples, festivals, and conservation messages as a top predator of Asian forests and edges.

Myths & Legends

Serpent-deity kings in South Asian tradition: in Hindu and regional folklore, divine serpents rule subterranean or watery realms; serpent-king figures embody power, guardianship, and sometimes vengeance when disrespected-often visualized as majestic hooded snakes.

In Buddhist tradition a hooded serpent, often shown as a King Cobra (Ophiophagus hannah), shelters the Buddha after his awakening from storm winds and rain; Southeast Asian art shows many hoods behind the meditating Buddha.

Mekong River snake stories (Thailand/Laos): people say holy snakes live in the river, shape waterways, and protect communities; seasonal tales of river guardian snakes and strange fireballs are part of local culture.

Cambodian/Khmer origin legend: a serpent princess marries a human, and the serpent lineage is tied to foundational stories of Khmer identity; serpent imagery is pervasive in temple architecture as guardians of thresholds and bridges.

Serpent-grove traditions in parts of India: sacred serpent groves and related practices preserve patches of habitat; stories describe serpents as guardians whose favor brings fertility and whose harm brings misfortune.

Colonial-era "hamadryad" name: early natural history texts sometimes called the king cobra the "hamadryad," borrowing a Greek term for a tree nymph-an enduring historical nickname reflecting its forest associations.

Conservation Status

VU Vulnerable

Facing a high risk of extinction in the wild.

Population Decreasing

Protected Under

  • CITES Appendix II (Ophiophagus hannah)
  • India: Wildlife (Protection) Act, 1972 (listed in protected schedules)
  • Bangladesh: Wildlife (Conservation and Security) Act, 2012 (protected species)
  • Malaysia: Wildlife Conservation Act 2010 (protected)
  • Thailand: Wildlife Preservation and Protection Act (protected)

Life Cycle

Birth 25 hatchlings
Lifespan 15 years

Lifespan

In the Wild
10–20 years
In Captivity
15–30 years

Reproduction

Mating System Polygyny
Social Structure Solitary
Breeding Pattern Seasonal
Fertilization Internal Fertilization
Birth Type Internal_fertilization

Solitary king cobras breed seasonally; males engage in ritual combat and court receptive females, likely mating with multiple partners. Reproduction is via internal fertilization. Females build a leaf nest, lay ~21-40 eggs, and guard the clutch until shortly before hatching.

Behavior & Ecology

Social Solitary Group: 1
Activity Diurnal, Crepuscular
Diet Carnivore Other snakes-especially large colubrids (e.g., rat snakes, Ptyas spp.)

Temperament

Generally shy and avoidance-oriented; retreats when given an escape route (Whitaker & Captain 2004).
Defensive escalation includes hooding, body-raising, and forward strikes if cornered.
Nest-guarding females show heightened aggression and will actively defend the nest (Vogel 2012).
Adult males may engage in ritualized combat (wrestling/pressing) during breeding season competition.

Communication

Loud hiss during threat display
Low-pitched growl-like hiss produced via respiratory structures Reported in field accounts; Vogel 2012
Visual threat display: raises forebody, spreads hood, aligns head to track intruder
Chemical communication: tongue-flicking to detect pheromones and prey/snake trails Jacobson's organ
Tactile signaling in male-male combat: body pressing and wrestling without typical biting
Substrate vibration sensitivity: responds to footsteps/ground-borne vibrations during disturbance

Habitat

Forest Rainforest Deciduous Forest Woodland Grassland Shrubland River/Stream Wetland Swamp Mangrove Agricultural/Farmland Plantation +6
Biomes:
Tropical Rainforest Tropical Dry Forest Wetland Freshwater
Terrain:
Mountainous Hilly Plateau Plains Valley Riverine Coastal Island +2
Elevation: Up to 6561 ft 8 in

Ecological Role

High-level predator and strong intraguild predator in South and Southeast Asian forest ecosystems, specializing in regulating snake communities.

Controls populations of medium-to-large snakes (including species that prey on rodents and birds), influencing trophic dynamics within reptile communities Can indirectly affect human-wildlife health risk by preying on medically significant venomous snakes (e.g., kraits and cobras) in shared landscapes Contributes to ecosystem stability by removing sick/injured individuals and shaping prey behavior and habitat use (top-down effects)

Diet Details

Main Prey:
Snakes Lizards Small vertebrates

Human Interaction

Domestication Status

Wild

King cobra (Ophiophagus hannah) has no domesticated line. People have captured them for display, snake-charming, skins and the live animal trade. Professionals handle them for research, antivenom work, and zoos. International trade is regulated (CITES Appendix II). Their special diet (ophiophagy—eat mainly other snakes) makes long-term keeping outside professional facilities not practical.

Danger Level

Extreme
  • Potentially fatal envenomation: primarily neurotoxic effects leading to progressive paralysis and respiratory failure without rapid medical care and ventilatory support.
  • Large body size and strike reach: adults commonly ~3-4 m and can elevate a substantial portion of the body to strike; maximum recorded total length 5.85 m increases handling and encounter risk.
  • High venom yield compared with many snakes (literature often reports large yields on milking; values vary by individual and method), increasing severity risk in bites with significant injection.
  • Defensive behavior: hooding, raising the forebody, and repeated striking when cornered; bites frequently occur during attempted capture/handling or when the animal is surprised at close range.
  • Human-wildlife conflict hubs: encounters at forest edges, plantations, and rural settlements within South and Southeast Asia; risk elevated for snake handlers, rescuers, and field workers.

As a Pet

Not Suitable as Pet

Legality: King Cobra (Ophiophagus hannah) is usually illegal or heavily restricted as a pet because it is very dangerous. Where allowed, special permits, secure inspected cages, experience, and CITES Appendix II rules are required; zoos and labs keep them.

Care Level: Expert Only

Purchase Cost: $500 - $5,000
Lifetime Cost: $20,000 - $100,000

Economic Value

Uses:
Public health (antivenom/clinical toxinology) Biomedical research (venom-derived pharmacology tools) Ecotourism and wildlife education Cultural value (symbolism/folklore; snake-handling traditions) Wildlife management (rescue/relocation services) Illegal wildlife trade (skins/live animals; regionally variable)
Products:
  • antivenom production inputs (controlled venom extraction in licensed facilities)
  • research reagents (purified venom components for neuroscience/toxinology studies)
  • zoological exhibition/education programming
  • ecotourism guiding (viewing in protected areas)
  • training/services (professional snake rescue and mitigation)

Relationships

Predators 5

Crested serpent eagle Spilornis cheela
Changeable hawk-eagle Nisaetus cirrhatus
Javan mongoose Urva javanica
Water monitor
Water monitor Varanus salvator
Wild boar
Wild boar Sus scrofa

Related Species 9

Indian cobra
Indian cobra Naja naja Shared Family
Monocled cobra
Monocled cobra Naja kaouthia Shared Family
Indochinese spitting cobra Naja siamensis Shared Family
Chinese cobra
Chinese cobra Naja atra Shared Family
Forest cobra
Forest cobra Naja melanoleuca Shared Family
Banded krait
Banded krait Bungarus fasciatus Shared Family
Common krait Bungarus caeruleus Shared Family
Black mamba
Black mamba Dendroaspis polylepis Shared Family
Eastern coral snake
Eastern coral snake Micrurus fulvius Shared Family

Ecological Equivalents 5

Animals that fill a similar ecological role in their ecosystem

Banded krait
Banded krait Bungarus fasciatus Banded kraits occur in South and Southeast Asia and feed on other snakes, so their diet is similar to the king cobra’s. Kraits are smaller and primarily nocturnal, but both species prey on other snakes.
Malayan krait
Malayan krait Bungarus candidus An elapid from mainland Southeast Asia that often eats other snakes and eels, making it similar in diet. It is mostly nocturnal and uses fewer visual threat displays.
Reticulated python
Reticulated python Malayopython reticulatus Often share lowland forest edges, plantations, and riparian corridors with king cobras. Both are large, top reptile predators that use similar habitats, but reticulated pythons eat mammals and birds, while king cobras primarily eat other snakes.
Burmese python
Burmese python Python bivittatus Another large, wide-ranging Asian constrictor that overlaps in habitat types and can be an ecological peer in terms of being a top reptilian predator. Contrasts strongly in foraging mode (ambush and constriction) versus the king cobra's active hunting and ophiophagy.
Water monitor
Water monitor Varanus salvator Monitor lizards often share wetlands and forest edges with king cobras. Both occupy high trophic positions and encounter each other at nests, eggs, or carcasses; monitors may eat king cobra eggs and young.

“The king cobra is the longest venomous snake in the world”

King cobras measure an average of 11 to 13 feet long. They live in southern China, India, and southeastern Asia. Their habitat includes streams, forests, bamboo thickets, and swamps. This snake is a carnivore eating other snakes, birds, and lizards. King cobras live about 20 years in the wild.

Incredible King Cobra Facts

  • It’s the only snake that builds a nest for its eggs.
  • They have enough venom in their bite to kill an elephant.
  • This reptile raises the top third of its body and expands its hood when it feels endangered.
  • Humans are the only predators of adult King Cobras (mongooses prey on juvenile snakes).
  • King cobras are the largest venomous snake. The largest king cobra ever measured nearly 19 feet and lived at the London Zoo during World War 2!

Scientific Name

A king cobra’s scientific name is Ophiophagus hannah. The Greek word Ophiophagus means snake eating and hannah is a reference to a Greek myth about tree-dwelling fairies. The king cobra eats other snakes and lives a lot of its life in trees. It sometimes goes by the name hamadryad. It belongs to the Elapidae family and is in the Reptilia class.

New research shows that the king cobras in Thailand may be an entirely different Ophiophagus species. They appear genetically distinct, but more research is needed to verify this.

There are 20 different related species of cobra including the forest cobra, the Ashe’s spitting cobra, the Mozambique cobra, and the Indian cobra. These are part of the Naja genus, or “true cobras.”

Head on view of king cobra against a green background

A king cobra’s scientific name is Ophiophagus hannah. The Greek word Ophiophagus means snake eating and hannah is a reference to a Greek myth about tree-dwelling fairies.

©mrjo/Shutterstock.com

History and Evolution

Cobras and the King Cobra evolved to have a hooded neck and head area. This protuberance is an expansion of the snake’s ribcage. These ribs are also able to pull outward the King Cobra’s excess skin in this area. It is believed that these deadly snakes adapted this feature in order to appear larger and more fearsome to any would-be threats in the wild. They couple this tactic with a loud and aggressive hiss that is meant to also scare off predators.

Research from scientists on cobra venom has actually led to the production of medicine, namely Cobroxin, that functions as a painkiller. Particularly, they are being used to stop transmission from nerves and even severe arthritis. Due to successful ventures in this type of research, there is ongoing testing and development of medicine derived from snake toxins.

Appearance

A king cobra is an animal with a smooth body that is covered in yellow, brown, green, and black scales. It has a chevron pattern of color running down the back of its neck. Some king cobras are leucistic. A leucistic king cobra is missing some most of its coloration and looks white. It’s not an albino because it has blue eyes as opposed to pink ones. A leucistic king cobra has all the qualities of a king cobra with the exception of its black, green, brown, and yellow scales.

King cobras are animals that have two dark eyes and fangs that are a half-inch long. A half-inch may sound very short for a snake’s fangs. But, they have to be short, so they won’t press through its lower jaw when it closes its mouth.

This snake can measure 12 to 18 feet long. As an example, an 18-foot-long king cobra is equal in length to 2/3 of a London bus! Compare this to the forest cobra that grows to be just 10 feet long. No wonder the king cobra is known as the longest venomous snake in the world.

The king cobra weighs between 11 and 20 lbs. A 20 lb king cobra is equal in weight to two gallons of paint. The heaviest king cobra lived in the New York Zoological Park and weighed just under 28 lbs. Male king cobras grow to be a little bigger than females. Read here to learn about the largest cobras in the world.

King Cobra vs rattlesnake

Measuring up to 18 feet long, the king cobra is known as the longest venomous snake in the world.

©Jolly Therattil/Shutterstock.com

Behavior

Though this snake is known for being aggressive, it has a shy nature. It would rather steer clear of people and other animals, if possible. It’s considered a solitary reptile. However, the group is called a quiver when they are seen together during the breeding season.

This reptile’s dark brown, green, and black scales allow it to blend in with its environment. However, when it feels threatened by an animal or human, it will expand its hood and raise the top half of its body off the ground. This is so it can move freely and meet the eye of whatever is threatening it. Also, this snake shows its fangs and hisses at the threat. Some people say that a king cobra’s hiss sounds a lot like a dog’s growl.

The defensive stance of a king cobra is a big part of the reason why they are considered to be aggressive reptiles. It’s enough to scare smaller animals away! However, these reptiles are simply defending themselves from threats.

The venom of a king cobra is not the strongest of all snakes, but the amount of venom it can inject in a person or animal in one bite is enough to kill an elephant or 20 people. The venom causes respiratory distress and cardiac failure. This would definitely qualify as a defensive feature of this snake!

How High Can a King Cobra Stand & 5 More King Cobra Facts Poster Image
Though this snake has a reputation for being aggressive, it actually has a shy nature.

Habitat

King cobras live in parts of southeast Asia, southern China, and India. Their habitat includes forests, bamboo thickets, streams, and swamps. These snakes live in a warm, humid climate.

They spend most of their time in trees blending into the dense, leaf-filled branches. They sometimes hang down from a tree branch to capture another snake. Other times king cobras come down from the trees to hunt for prey on the forest floor. They may travel to nearby streams to look for food. These reptiles can swim fairly well and have been seen moving along through the water.

When the weather cools off in late fall and winter, king cobras migrate to dens to stay warm. They come back out in the springtime.

What Do King Cobras Eat 11+ Foods in their Diets Cover image
The king cobra’s habitat includes forests, bamboo thickets, streams, and swamps.

Diet

What do king cobras eat? King cobras are carnivores eating birds, lizards, and other snakes. When those are scarce, these snakes will eat small rodents. If a king cobra eats a large amount of prey at one time, it may not eat again for a few months.

This snake has excellent eyesight. It can sometimes spot prey while resting on a high branch in a tree. Like other snakes, it also has an impressive sense of smell.

King cobras are fast and move quickly to strike their prey without having to hold it in place like other cobras.

To discover our complete guide on the diet of king cobras, make sure to check out ‘What Do King Cobras Eat: 11+ Foods in their Diet.’

King Cobra - Close Up

King cobras have an impressive sense of smell.

©Suresh Suryasree/Shutterstock.com

Predators and Threats

Poachers sometimes set traps for these snakes and kill them for their skin, to make medicine or even to eat. Some of these reptiles are sold illegally as exotic pets.

However, humans are not the only predators of the king cobra. Mongooses, honey badgers, and secretary birds also prey on them. The mongoose is immune to small amounts of their venom, but they really win the fight using their speed and agility.

Since these reptiles need a certain type of environment to thrive and they have a venom that is capable of killing a human, it’s definitely not a good idea for anyone to keep one as a pet.

In southeast Asia, snake charmers sometimes use king cobras in their street performances. They pretend like the king cobra is charmed by the music they’re playing on the flute. These snakes have been known to bite snake charmers as well as escape into an environment where they can’t survive.

Habitat loss due to deforestation and land clearing is another threat to king cobras.

The official conservation status of king cobras is Vulnerable with a decreasing population. Though they are on the endangered list of species in India, this country is taking steps to protect them. They are focusing on properly educating the public about these reptiles. Plus, they are also microchipping king cobras so they can track them if they are captured by exotic pet dealers. Vietnam has given these snakes a protected species status.

Side view of king cobra with its mouth gaping open

King cobras have been known to bite snake charmers as well as escape into an environment where they can’t survive.

©mrjo/Shutterstock.com

Reproduction and Life Cycle

The breeding season of a king cobra goes from January to April. When a male king cobra is interested in a female, it pushes her body with its head. If other male king cobras are in the area, the males wrestle and the strongest one mates with the female. King cobras are monogamous (stay with the same mate each breeding season).

The female creates a nest by pushing twigs, grass, and other vegetation into a pile. The temperature within the pile/nest is around 80 degrees Fahrenheit. Shortly after, she lays 21 to 40 (sometimes more) eggs in the nest. The eggs hatch between 51 and 79 days later. As a note, the king cobra is the only snake that builds a nest for its eggs. The female stays with the nest and fiercely guards her eggs from predators until they hatch. Consequently, most of the king cobra eggs will hatch and the babies will survive.

Baby king cobras are called hatchlings. Each hatchling can weigh from less than an ounce to one and a half ounces. The hatchlings usually measure from 12 to 29 inches long. A 12-inch-long hatchling is equal to the size of a small wooden ruler.

The hatchlings are brightly colored. This helps to scare off predators. As they grow, their scales turn dark brown, black, and green. They leave the nest to hunt prey and live independently right after hatching. The venom of a hatchling is every bit as powerful as an adult king cobra. Keep that in mind in case you ever see one!

These reptiles are vulnerable to various types of skin fungi. The lifespan of a king cobra in the wild is around 20 years. But the oldest king cobra record is held by a snake that reached 22 years of age!

Population

The exact population of king cobras is unknown. However, the conservation status of the king cobra is Vulnerable. Its population is decreasing. Loss of habitat and poaching activity are two major threats to the population of this snake. It’s on the endangered species list in India.

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Sources

  1. Smithsonian National Zoo & Conservation Biology Institute / Accessed November 4, 2020
  2. National Geographic / Accessed November 4, 2020
  3. Animalia / Accessed November 4, 2020
Heather Ross

About the Author

Heather Ross

Heather Ross is a secondary English teacher and mother of 2 humans, 2 tuxedo cats, and a golden doodle. In between taking the kids to soccer practice and grading papers, she enjoys reading and writing about all the animals!

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King Cobra FAQs (Frequently Asked Questions)

Yes, king cobras are generally considered to be the most intelligent species of snakes. Among factors that lead to this perception of intelligence is that appear to recognize their handlers, approach hunting of different prey with new strategies, and they build large nests that no other snake species builds.

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