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The glow-worm belongs to a family of beetles known as the Lampyridae or fireflies. The fireflies
are a huge group containing over 2000 species, with new ones being discovered all the time. The
feature which makes fireflies and glow-worms so appealing is their ability to produce an often
dazzling display of light. The light is used by the adult fireflies as a signal to attract a mate, and
A each species must develop its own 'call-sign' to avoid being confused with other species glowing
nearby. So within any one area each species will differ from its neighbours in some way, for
example in the colour or pattern of its light, how long the pulses of light last, the interval between
pulses and whether it displays in flight or from the ground.