Spiders are arachnids, and like all arachnids, have eight legs. Spiders are different from insects, which have only 6 legs. Spiders fall under the phylum Arthropoda, hence are related to crabs and prawns.
Spiders are also carnivores and hunt their prey using venom. Some species of spiders are ambush predators while others create large webs which can trap prey.
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