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Life on Earth en.wikipedia.org Life on Earth: A Natural History by David Attenborough is a television natural history series made by the BBC. It was transmitted in the UK from 16 January 1979. During the course of the series Attenborough travels the globe in order to trace the story of the evolution of life on the planet. Flies en.wikipedia.org True flies are insects of the order Diptera. They possess a pair of wings on the mesothorax and a pair of halteres, derived from the hind wings, on the metathorax. Halteres en.wikipedia.org Halteres (singular halter or haltere) are small knobbed structures modified from the hind wings in some two-winged insects. They are flapped rapidly and function as gyroscopes, informing the insect about rotation of the body during flight.