king cobra (Ophiophagus hannah) is the world's longest venomous snake, with a length up to 5.6 m (18.5 ft). This species is widespread throughout Southeast Asia and parts of India, and is found mostly in forested areas. South Asia, Southeast Asia, and the southern areas of East Asia (southern China) where it Is not common. It lives in dense highland forests preferring areas dotted with lakes and streams. King cobra populations have dropped in some areas of its range because of the destruction of forests. inducing severe pain, blurred vision, vertigo, drowsiness, and paralysis. Envenomation progresses to cardiovascular collapse, and the victim falls into a coma. Death soon follows due to respiratory failure.
In the past, the LD50 of the king cobra's venom was treated as 1.6 mg/kg – 1.8 mg/kg (which was one of the least venomous elapids). However, in recent toxicology study the LD50 of Chinese king cobra venom was found to be 0.34 mg/kg. The value is lower than that of many Naja species found in the same habitats (such as the Chinese cobra), showing that the king cobra can actually be more venomous than many other cobras.
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