Spider, Description, Behavior, Species, Classification, & Facts

Spider, any of more than 46,700 species of arachnids that differ from insects in having eight legs rather than six and in having the body divided into two parts rather than three. All spiders are predators, feeding almost entirely on other arthropods, especially insects.

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Spider, Description, Behavior, Species, Classification, & Facts

Spider, Description, Behavior, Species, Classification, & Facts

Fast acrobatic maneuvers enable arboreal spiders to hunt dangerous prey