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Many familiar species belong to the phylum Arthropoda—insects, spiders, scorpions, centipedes, and millipedes on land; crabs, crayfish, shrimp, lobsters, and barnacles in water. Arthropods are considered the most successful animals on Earth.
Large flocks of butterflies, all kinds of happy insects, seem to be in a perfect fever of joy and sportive gladness. John Muir
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