The Maori name for cicadas is kihikihi. Cicadas lay eggs the size of a grain of rice in a herring-bone pattern in the thin branches of trees. Each female lays 400 to 600 eggs in 40 to 50 nests. Eggs hatch to become nymphs, which are soft and creamy white and feed on tree roots underground. When mature, the nymphs climb up tree trunks to moult and become adults. Male cicadas die soon after mating. Cicadas can be black, green or brown, and they have wings which filter out ultraviolet light. They eat by sucking sap. Only male cicadas sing, and the cicada song is the loudest sound made in the insect world.