The yellow-bellied sea snake, yellowbelly sea snake, or pelagic sea snake, is a species of sea snake found in tropical oceanic waters around the world. It is the only member of the genus Pelamis. These snakes breed in warm waters, and they are ovoviviparous with a gestation period of about 6 months. According to Raymond Ditmars, an American Herpetologist, females bear live young in tidal pools. They are helpless on land, and they sometimes form large aggregations of thousands in surface waters. These snakes have a neurotoxic venom that is used against their fish prey. No human fatalities are known. (Wiki.)

photo by: oceana.org

The manta ray (Manta birostris) is the largest species of the rays. The largest known specimen was more than 7.6 metres (25 ft) across, with a weight of about 1,300 kilograms (2,900 lb). It ranges throughout tropical waters of the world, typically around coral reefs. The breeding behaviour observed for manta rays is similar to other closely related rays. Copulation occurs near the surface, no deeper than a metre below. It begins with the male chasing the female, for up to half an hour, both often closely followed by a train of hopeful suitors. Such mating trains seem to be triggered by a full moon. The male bites the pectoral fin and then moves its claspers into the cloaca, holding it there for a minute to a minute and a half while copulation takes place. (Wiki)