Yellow-lipped sea krait (Laticauda colubrina) in southwest Palawan, Philippines. Sea kraits inhabit two worlds, the sea and the land. They feed in the sea on eels and have several adaptations for swimming and diving not found in terrestrial snakes. However, they return to land for digestion of food, sloughing their skin, mating and laying eggs. This is the largest species of sea snake, and known to occur in high densities on small tropical islands.