You'll notice that the places that you see blue veins are in areas where the skin is thin and the blood vessel underneath is pushing up on it stretching the skin over it. Light hitting the dark color of the vein underneath the skin, in combination with the skin itself is what causes it to appear blue in these areas.
Common krait. The common krait (Bungarus caeruleus), also known as Indian krait or blue krait) is a species of venomous snake of the genus Bungarus found in the jungles of the Indian subcontinent. It is a member of the big four species, inflicting the most snakebites on humans in India.
The King Cobra (Ophiophagus hannah) is a species of the Elapidae family. It is the world's longest venomous snake with a length that can be as large as 5.6 m (18.5 ft).This species is found in a number of areas, found throughout south-eastern Asia and into Pakistan and India.ts genus name, Ophiophagus, literally means snake-eater, and its diet primarily consists of other snakes, including larger pythons and even smaller members of its own species. The venom of the King Cobra is primarily neurotoxic, and the snake is fully capable of killing a human with a single bite.