Insects are invertebrates in a class referred to Insecta. They
are the most numerous and most widespread arthropods. Insects are
the most diverse group of animals on the earth, with around 925,000
species describedmore than all other animal groups combined:
Insects may be found in nearly all environments on the planet, although
only a small number of species have adapted to life in the oceans,
where crustaceans tend to predominate.
There are approximately 5,000 dragonfly species, 2,000 praying
mantis, 20,000 grasshopper, 170,000 butterfly and moth, 120,000
fly, 82,000 true bug, 350,000 beetle, and 110,000 bee and ant species
described to date. Estimates of the total number of current species,
including those not yet known to science, range from two to thirty
million, with most authorities favoring a figure midway between
The study of insects is called entomology.
All text is available under the terms
of the GNU Free Documentation License