"Over the past 400 million years, evolution has produced a wide variety of arthropod species adapted to their environments. About 1 million of the 1.4 million described animal species on earth are insects, and millions more are believed to exist. Contrary to popular belief, of the 1 million described insect species, only 5 000 can be considered harmful to crops, livestock or human beings (Van Lenteren, 2006)."