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.
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 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.
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