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The adult insect, known as an imago, is usually 2 to 5 cm (1 to 2 in) long, although some tropical species can reach 15 cm (6 in), e.g. Pomponia imperatoria from Malaysia. Cicadas have prominent eyes set wide apart on the sides of the head, short antennae protruding between or in front of the eyes, and membranous front wings. Also, commonly overlooked, cicadas have three small eyes, or ocelli, located on the top of the head between the two large eyes that match the colour of the large eyes.
Cicadas live in temperate to tropical climates where they are among the most widely recognized of all insects, mainly due to their large size and unique sound. Cicadas are often colloquially called locusts, although they are unrelated to true locusts, which are a kind of grasshopper. Cicadas are related to leafhoppers and spittlebugs.