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.
But youâd be wrong, as the sea krait â or Chinese sea snake â lurks around coral reefs, waiting to catch any unsuspecting prey with its paralyzing venom. Thatâs the venom which is 10 times the strength of cobra venom, in case youâre still thinking these things might be harmless.