According to some Polynesians, a creator god named Tangaloa sent a bird messenger over an endless primal sea. At last Tangaloa threw a rock into the sea so the tired bird would have a place to land. Then the god created all the islands in the same way. The bird made the first people by giving arms, legs, hearts, and souls to maggots. Other Polynesian stories describe creation as the union of two opposing qualities: Po (darkness) and Ao (light). Polynesian and Micronesian cosmogonies often include the act of separating the earth from the sky. Melanesian creation myths generally involve ancestral heroes who wander from place to place, forming the landscape and creating the rules of society.