How a Snake That Eats Cobras Redefined the Meaning of ‘King’

The king cobra, Ophiophagus hannah, is the longest venomous snake at 18.7 feet, an apex predator that feeds on other snakes — including its own kind — and genetically closer to mambas than true cobras. A 19.2-foot claim remains unverified.

King Cobras Are Not Really Cobras

True cobras belong to the genus Naja, found across Africa, Asia, and the Middle East. They are venomous snakes known for their ability to flare their neck ribs into a hood when threatened. King cobras, however, belong to the genus Ophiophagus, meaning “snake eater,” and are genetically more closely related to mambas than to true cobras. Despite this, they share the iconic hooding behavior with their Naja relatives.

A Shy but Deadly Snake

King cobras are part of the Elapidae family, venomous snakes with fixed, forward-positioned fangs. They possess 0.5-inch fangs capable of injecting up to 1 gram of venom — nearly 10 times the maximum load of the inland taipan, the most venomous snake on Earth. This potent venom is reserved for subduing large, venomous prey, primarily other snakes. King cobras are not aggressive and prefer to flee from humans. When threatened, they elevate their bodies 3–4 feet off the ground, spread their hoods, and emit a low-pitched growl — a warning before striking. Venom is essential for paralyzing prey and aiding digestion, and replenishing it takes time.

An infographic summarizing facts about the King Cobra, including its record length of 18.7 feet, its genetic relation to mambas, its apex predator status, venom details, and a contested 19.2 feet claim. Illustrations include a cobra, a ruler, and various icons. — An infographic presenting facts about the King Cobra, titled ‘KING COBRA: THE WORLD’S LONGEST VENOMOUS SNAKE’. It details its record length of 18.7 feet, its genetic classification as Ophiophagus (closer to mambas) rather than Naja (true cobras), its role as an apex predator that consumes other snakes, and information about its venom (1 gram max load, 0.5-inch fangs). The graphic concludes with a note on an unverified 19.2 feet claim from a 1924 report.

The Largest King Cobra on Record

King cobras typically grow to 10–12 feet, but documented specimens have reached much greater lengths. The longest verified specimen measured 18.7 feet, captured near Port Dickson in Negeri Sembilan, Malaysia, in 1937. It was later displayed at the London Zoo until World War II. Another claim, citing a 19.2-foot snake reported by C.J. Aagaard in 1924, remains unverified. The original publication lists 18.3 feet, and despite several scientific studies referencing 19.2 feet, no verifiable source supports this figure.

KING COBRA: Scientific name 'Ophiophagns'. The largest venomous snake in the world. This snake has the characteristics of being the only venomous snake that lays eggs in nests. — King cobras are not part of the Naja genus, which includes the snakes commonly referred to as true cobras.

King cobras are heavy snakes, weighing from 13 to 26 pounds. Their size and venom make them formidable apex predators, shaping the populations of venomous snakes in their ecosystems. They are the only venomous snakes known to lay eggs in nests, a unique reproductive trait among their kind.

King cobra in a tree — The king cobra is the longest venomous snake.

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