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The itsy bitsy spider went up the water spout
Down came the rain and washed the spider out
Out came the sun and dried up all the rain
And the itsy bitsy spider climbed up the spout again
The Tale of Little Miss Muffet
Spiders are arthropods called arachnids. There are some 34,000 species belonging to about 105 families, although some specialists in the study of arachnids estimate that only 20 percent of spider species have been described, which means that there may be as many as 170,000 spider species.