King Cobra
10 to 18 feet (3 to 5.5 meters)
13 to 20 pounds (6 to 9 kg)



The King Cobra (Ophiophagus hannah), renowned as the world’s longest venomous snake, is a remarkable and formidable reptile in the animal kingdom. It belongs to the family Elapidae, which includes some of the most venomous snake species like cobras, mambas, and sea snakes. The King Cobra is unique within its family, as it is the only member of the genus Ophiophagus, meaning “snake-eater,” indicative of its diet primarily consisting of other snakes, including venomous ones.

Found predominantly in forests across South and Southeast Asia, including India, China, Indonesia, and the Philippines, the King Cobra inhabits dense highland forests, bamboo thickets, mangrove swamps, and even agricultural regions. Its preference for diverse habitats highlights its adaptability and formidable presence across a wide geographic range.

In the Animal Kingdom, the King Cobra is part of the class Reptilia and order Squamata, the order encompassing all snakes and lizards. Distinguished by its impressive length, which can exceed 18 feet (5.5 meters), and its distinctive hood, the King Cobra is revered and feared for its potent venom and commanding presence. Despite its intimidating reputation, the King Cobra plays a crucial ecological role, maintaining the balance of its ecosystem by preying on other snake species, including those that are venomous. The conservation of the King Cobra is vital, not only for the preservation of a unique species but also for the health of the ecosystems it inhabits.

Conservation Concerns

The King Cobra faces numerous threats throughout its range, including habitat loss and fragmentation, human encroachment, and persecution due to fear and misunderstanding. Additionally, illegal wildlife trade for its skin and use in traditional medicines poses a significant threat to its survival.

While there is limited data on population trends and distribution, the King Cobra is listed as “Vulnerable” on the IUCN Red List due to these various threats.

Critically Endangered
Near Threatened
Least Concern

Physical Characteristics

The King Cobra is one of the most distinct and imposing snakes in the world, with unique physical characteristics:

Physical Appearance:

Body: The King Cobra has a robust and muscular body, well-suited to its predatory lifestyle. It is renowned for being the longest venomous snake in the world.

Coloration: Its color can vary greatly depending on the region, ranging from olive-green, brown, black to a more yellowish hue. The belly is typically pale yellow or cream. Some individuals may exhibit faint banding or chevron patterns.

Head: The head of the King Cobra is elongated and somewhat flattened, with a prominent snout. Unlike other cobras, it doesn’t have the typical hood markings but often has a pair of large scales on the top of the head.

Eyes: It has medium-sized eyes with round pupils.

Hood: When threatened, the King Cobra can raise a significant portion of its body off the ground and spread its neck ribs to form a distinctive hood.

Size and Weight:

Length: The King Cobra is the longest of all venomous snakes. Adult sizes typically range from 10 to 13 feet (3 to 4 meters), but they can reach lengths of over 18 feet (5.5 meters) in some cases.

Weight: An adult King Cobra weighs between 13 to 20 pounds (6 to 9 kg), although larger specimens can weigh more.

The King Cobra’s physical form, with its impressive size and hood, makes it a symbol of power and fear in the animal world. Its ability to stand tall and confront threats, along with its agility and potent venom, make it one of the most respected and formidable predators in its natural habitat.


The King Cobra’s reproductive cycle is notable for several unique aspects:


King Cobras usually mate during the dry season, which can vary depending on their geographic location. The males engage in ritual combat to establish dominance and earn the right to mate with receptive females. This involves wrestling and intertwining their bodies but typically does not lead to serious injury.


After mating, the female undergoes a gestation period, which is the time she spends developing eggs internally before laying them. This period lasts about 60 to 80 days, depending on environmental factors and the health of the female.

Nesting and Egg Laying:

One of the most remarkable aspects of the King Cobra’s reproductive cycle is that the female builds a nest for her eggs, which is rare among snakes. She constructs it using leaves, soil, and other materials, making a mound-like structure. Then she lays her eggs inside this nest. The clutch size varies but typically consists of 20 to 40 eggs.


After laying the eggs, the female King Cobra exhibits an unusual behavior of guarding the nest. She stays near or on the nest to protect the eggs from predators, a level of parental care that is uncommon among snakes. The incubation period lasts for about 60 to 90 days.


The hatchlings are independent from birth and are capable of fending for themselves. They are born with venom and fangs, enabling them to hunt and protect themselves.

The reproductive cycle of the King Cobra, particularly its nest-building and parental care, is a unique and fascinating aspect of its biology. This behavior underscores the adaptability and resilience of the species, contributing to the survival of the offspring in often harsh and challenging environments.


The King Cobra has a substantial lifespan, both in the wild and in captivity:

Lifespan in the Wild:

In their natural habitat, King Cobras typically live for around 15 to 20 years. However, this can vary based on factors such as availability of prey, environmental conditions, and threats from predators or human interference.

Lifespan in Captivity:

In captivity, where they are protected from predators and have consistent access to food and medical care, King Cobras can live longer. They often reach ages of 20 years or more, with some individuals living up to 25 years in zoological parks or reptile conservation centers.

Major Threats:

  1. Habitat Loss: The primary threat to King Cobras is habitat destruction due to deforestation, urbanization, and agricultural expansion, leading to a loss of their natural hunting grounds and shelter.
  2. Human Conflict: Due to their venomous nature and size, King Cobras are often feared and persecuted by humans, particularly in areas where they come into close contact with human settlements.
  3. Illegal Wildlife Trade: They are sometimes captured for the illegal pet trade or killed for their skin and other body parts, used in traditional medicine and for other purposes.

Conservation efforts, legal protection, and habitat preservation are crucial for the survival of King Cobras in the wild. Their role as apex predators in their ecosystems makes them important for maintaining ecological balance. Public education and awareness programs can also help mitigate human-snake conflicts, contributing to the conservation of this iconic species.

Eating Habits

The King Cobra has distinctive eating habits, particularly noted for its preference for other snakes:


Primary Prey: The King Cobra’s diet is unique among snakes as it primarily preys on other snakes, both venomous and non-venomous. This includes species like rat snakes, pythons, and even other cobras.

Other Prey: Occasionally, it may also feed on small mammals, birds, and lizards, especially when snake prey is scarce.

Hunting Techniques:

Active Hunter: The King Cobra is an active hunter. It uses its keen sense of smell and excellent vision to locate prey.

Venomous Bite: Upon locating its prey, the King Cobra delivers a venomous bite. Its potent neurotoxic venom quickly immobilizes the prey, making it easier to swallow.

Feeding Behavior:

Swallowing Whole: Like most snakes, the King Cobra swallows its prey whole. Its flexible jaws enable it to consume large prey relative to its size.

Infrequent Feeding: Due to its large size and the substantial meals it consumes, the King Cobra can survive on relatively infrequent feedings, sometimes going for weeks or months between meals.

The King Cobra’s dietary specialization in eating other snakes underlines its role as an apex predator in its ecosystem. Its presence helps control the populations of various snake species, contributing to the ecological balance in the regions it inhabits. The King Cobra’s hunting skills, combined with its potent venom, make it one of the most formidable predators in the snake world.


The King Cobra (Ophiophagus hannah) stands out as a unique species among snakes for several reasons:

1. Longest Venomous Snake: The King Cobra is the world’s longest venomous snake. It can reach lengths of over 18 feet (5.5 meters), making it significantly larger than most other venomous species.

2. Specialized Diet: It is primarily ophiophagous, meaning it preys almost exclusively on other snakes, including venomous species. This specialized diet is uncommon among snakes.

3. High Intelligence: The King Cobra displays a higher level of intelligence compared to many other snake species. It is known for its ability to learn, adapt to new situations, and exhibit problem-solving behaviors.

4. Hood Expansion: Like other cobras, the King Cobra can expand its hood as a defensive posture. However, its hood is narrower and longer compared to those of other cobra species.

5. Venom Potency: Its venom is not only highly neurotoxic but also produced in large quantities. This makes a King Cobra bite extremely dangerous.

6. Nest Building and Parental Care: Uniquely among snakes, female King Cobras build nests for their eggs, which they guard ferociously. This level of parental care is rare among reptiles.

7. Cultural Significance: The King Cobra holds a place of reverence and fear in many Asian cultures, featuring prominently in folklore and mythology.

These distinctive traits make the King Cobra a subject of fascination and respect in the animal kingdom. Its ecological role as an apex predator helps maintain balance in its environment, controlling populations of other snake species.

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1. How venomous is the King Cobra?

The King Cobra (Ophiophagus hannah) is highly venomous and is considered one of the most dangerous snakes in the world, not solely because of the potency of its venom, but also due to several other factors:

1. Venom Potency:

  • The venom of the King Cobra is neurotoxic, affecting the nervous system. It can cause pain, dizziness, paralysis, and even respiratory failure in victims.

2. Venom Quantity:

  • The King Cobra can deliver a large amount of venom in a single bite—up to 7 milliliters. This is significantly more than most other venomous snakes can inject.

3. Comparison with Other Venomous Snakes:

  • Inland Taipan: Often considered the most venomous snake based on the toxicity of its venom (in terms of LD50), the Inland Taipan’s venom is more lethal than the King Cobra’s on a per-milligram basis. However, the Inland Taipan is less aggressive and less likely to encounter humans.
  • Black Mamba: The Black Mamba, another highly venomous and aggressive snake, has a faster-acting venom than the King Cobra but usually delivers less venom per bite.
  • Russell’s Viper: While less venomous than the King Cobra, the Russell’s Viper is responsible for more fatalities in Asia due to its proximity to populated areas.

4. Aggressiveness:

  • The King Cobra is known for its intelligence and can be more aggressive when cornered. It is also one of the few snakes that actively defends its nest.

In summary, the danger posed by the King Cobra comes from a combination of its large size, the ability to deliver large quantities of potent neurotoxic venom, and its behavioral tendencies. While there are snakes with more toxic venom on a per-milligram basis, the King Cobra’s overall profile makes it one of the most formidable venomous snakes in the world.

  • Britannica, King Cobra,, retrieved January 2024.
  • Burnie, David & Wilson, Don, Animal, Smithsonian Institute, Washington DC.
  • Hickman et al, Integrated Principle of Zoology, McGraw Hill, Boston.