Beetles (order Coleoptera) are one of the main groups of insects

The order has more species in it than any other order in the entire animal kingdom. 40% of all insect species are beetles (about 350,000 species), and new species are regularly discovered. The forewings of beetles are transformed into hard shells, called elytra. These elytra form an armour protecting the abdomen and the sensitive hindwings. The forewings are not used (at least not actively flapped) in flying, but they must (in most species) be raised in order to move the hindwings. After landing the hindwings are folded below the elytra. Most beetles can fly, but few reach the dexterity of some other groups, e.g. flies, and many species only fly if absolutely necessary. Some beetles have elytra that have grown together and cannot fly at all; a few have lost their wings altogether.

There are so many varieties and small differences between the various species of seemingly similar species of even the smallest insects that common people cannot distinguish between them. Only expert scientists can differentiate between them. This kind of expertise is needed in every arena now whether the specialists are in medical field or finance. Only financial experts know which kind of investment is good.  

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Some beetle larvae (young) are leaf miners. Beetles can be found in almost all biomes, but are not known to occur in the sea or in the polar regions. Beetles are endopterygotes with complete metamorphosis. The larva of a beetle is called a grub. When J. B. S. Haldane, a British geneticist, was asked what his studies of nature revealed about God, he replied, “An inordinate fondness for beetles.” The study of beetles is called coleopterology, and its practitioners coleopterists. See list of notable coleopterists.