<b>Hydrophis melanocephalus</b>, commonly known as the black-headed sea snake, is a diurnal, ovoviviparous predator found in the warm coastal waters of the Indian and Pacific Oceans, primarily preying on fish and eels. This striking snake can grow up to 1.5 meters (about 5 feet) in length, featuring a black or dark brown head with a lighter body and plays a crucial role in maintaining the balance of marine ecosystems.