King Cobra: The Longest Venomous Snake and the Snake That Eats Snakes

The king cobra, Ophiophagus hannah, is the longest venomous snake on Earth and one of the most iconic snakes anywhere. Its scientific name means snake-eater, and that is exactly what it is: a specialist predator that hunts and swallows other snakes, including venomous ones. Towering up off the ground with its hood spread, it is unmistakable, and yet it is far shyer and more reclusive than its dramatic image suggests.

Where it lives

The king cobra ranges across South and Southeast Asia, including India, Thailand, and Indonesia, along with much of southern China and the surrounding region. It favors dense forest, mangroves, bamboo thickets, and the edges of farmland and rivers. It is a strong climber and swimmer and tends to stay near water and good snake-hunting ground.

Because its diet is built around other snakes, the king cobra goes where snakes are plentiful, which often means humid lowland forest and the margins of cultivated land. Deforestation has shrunk much of its habitat, and the species is now classed as vulnerable across its range. Where forest remains intact, a single king cobra may roam a large home range in search of prey, which is one reason direct encounters with people are relatively uncommon despite the snake's wide distribution.

Size and appearance

It is the longest venomous snake in the world, commonly 10 to 13 feet and occasionally approaching 18 feet. The color ranges from olive and tan to brown or near-black, often with faint pale crossbands. The head is broad, and when threatened the snake rears up a third of its length and flares a narrow hood. Unlike true cobras, it has a pair of large scales at the back of the crown, called occipital scales.

• Very long, relatively slender body for a cobra
• Narrow hood, flared when alarmed
• Olive to brown or blackish color with faint banding
• Capable of raising a large part of its body off the ground

Venom and danger to people

The king cobra produces a large quantity of neurotoxic venom, enough that a serious untreated bite is life threatening. It deserves great caution within its range. Behaviorally, though, it is wary and usually retreats from people. Most encounters end with the snake leaving, and bites are uncommon relative to many other Asian species. As everywhere, the highest risk comes when people corner, handle, or try to kill the animal, especially in defense of nests.

It is worth keeping this in perspective. Across Asia, far more snakebite deaths are caused by smaller, more abundant species such as cobras of the genus Naja, kraits, and vipers that live close to people and farmland. The king cobra is more famous and more dramatic, but its preference for forest and its shy disposition make it a comparatively rare cause of human harm. Antivenom and rapid hospital care remain essential after any king cobra bite.

How to identify it

Within its range, the sheer length, the narrow hood, and the habit of rearing high off the ground separate the king cobra from true cobras and from harmless rat snakes. It is not actually a member of the true cobra genus, but it is an elapid like them and like the black mamba. To see how it ranks among the world's heavyweights, read the largest snakes guide, and browse more profiles on the species hub.

Notable facts

• It feeds mainly on other snakes, which is why its genus name means snake-eater.
• It is the only snake known to build a nest of leaves for its eggs, which the female guards.
• It can rear up several feet, sometimes high enough to look an adult human in the eye.
• It is culturally revered across much of its range and is protected in several countries.

The king cobra also plays a special role in the cultures where it lives. It appears in religious traditions, festivals, and folklore across South and Southeast Asia, often treated with a mix of fear and reverence. That cultural standing, combined with its ecological role as a top predator of other snakes, gives people good reasons to protect it rather than destroy it, even where it is feared.

The king cobra blends genuine danger with surprising restraint, a giant predator that mostly wants to be left alone. Respect, distance, and good local knowledge are the right tools around it. Explore more of the world's most remarkable snakes on the species hub, or see the giants ranked in the largest snakes guide.