In the Pacific there are around 4 dozen sea snakes that can be found; of them, only one has ever been reported in Hawaiian waters: the yellow-bellied sea snake (Pelamis platurus). This is the only open-ocean marine snake. Even though it does occur here naturally, it is by no means common. In fact, you'll likely never see one. Only 20 specimens have been documented. Marine sea snakes are very poisonous. They are distantly related to cobras. But as far as venomous snakes go, these guys are very timid and rarely bite people. I have swum with sea snakes on several occasions in the south pacific and even played with them. They don't want to bite you if they can help it.
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