There are many different kinds of mites, and we have only begun to know them.
So far, about 30,000 species are known, but it is likely that about a half million more species remain to be discovered.
Mites are among the most diverse and successful of all the invertebrate groups, and many live freely in the soil or water.
But there are also a large number of species that live as parasites on plants, animals, and some that feed on mold.
The dust mite found in homes is perhaps the best known mite.
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