Although caudal patterns may vary, elsewhere the colors are pretty well standardized.
We rented a tiny boat, a motor, and a driver, on the docks of a small fishing village on Costa Rica’s Pacific coast. Cost had been negotiated successfully, and within a few minutes we were on our way westward on the choppy waters of the bay. Our target species on this watery interlude was the yellow-bellied sea snake, Pelamis platurus, which species was quite common in the region, but that was most commonly seen by fishermen in the ocean slicks, patches of smooth-surfaced water that drifted between the choppy surfaces and when the snake became stranded on the beach.

Although Pelamis grows to nearly 4’ in length, those that we saw ranged from 24 to about 32 inches. On that trip we saw more than 2 dozen of these pelagic serpents. And indeed they are pelagic, ranging from the Asiatic shores of the Indian and Pacific oceans, Africa, and in the New World from Central America to California (rare in the USA). It has also been found far asea. Although this has often been said to be the most widely distributed of the world’s snakes, I’m wondering if the tiny flowerpot (blind) snake is not now a close runner-up?

Male Pelamis tend to be the smaller. This is a fish eating species.