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There are well over 1 million different known species of insects in the world,
and some experts estimate that there might be as many as 10 million.

All these species are divided up into about 32 orders, depending on whose taxonomic system you use, of which, the largest is the Beetles, or Coleoptera, with 125 different families and around 500,000 species they are an incredibly diverse group of animals. In fact, one in every four animal species on this planet is a beetle.

, everywhere on land anyway, very few insects have colonised the sea, though some like the Marine Flies (Halobates sp.) and the Seashore Collembolan, Anurida maritma, live on the surface. Also the larva of a small number of True Flies (Diptera) and Beetles (Coleoptera) live beneath the surface, mostly in rockpools.

On the land however there isn't anywhere you can go that you can't find some insects, even in the frozen extremes of Arctica and Antartica you will find some insects alive and active during the warmer months.

You will find that insects are ubiquitous, they are in the soil beneath your feet, in the air above your head, on and in the bodies of the plants and animals around you, as well as on and in you.

Some of the most adventurous insect are the Brine Flies (Ephydra), you can find them living in the strangest places including, the larva of Ephydra hyans in Mono Lake California which is nearly as salty as the Dead Sea, the larva of Psilopa petrolei in pools of crude oil also in California, and the adults and larva of Scatella thermarum in the hot springs of Iceland, the adults live on the mats of algae which float on the water's surface, and the larva live beneath the mats and in water, which is as hot as 48 degrees Celsius, which, for most people, is too hot to put your hand into.

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