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Insects have a three-part body consisting of the head, the thorax, and the abdomen. They have three pairs of jointed legs, compound eyes and two antennae. The number of extant species is estimated at between six and ten million. The life-cycles of insects vary but most hatch from eggs. Insects typically move by walking, flying or occasionally swimming. Humans regard certain insects as pests. Other insects are considered economically or ecologically beneficial, like silkworms and bees. The ancient Chinese regarded cicadas as symbols of rebirth or immortality.