spider Table of Contents IntroductionGeneral featuresSize rangeDistributionImportanceForm and functionExternal featuresInternal featuresNervous system and sensesDigestion and excretionRespirationCirculationReproductive systemSpecialized featuresVenomSilkNatural historyReproduction and life cycleCourtshipMatingEggs and egg sacsMaturationFeeding behaviourStalking preySpider websClassificationDistinguishing taxonomic featuresAnnotated classification References & Edit History Quick Facts & Related Topics Images & Videos For Students spider summary Quizzes Creepy Crawlers Quiz Animal Factoids Creepy Crawlies Quiz Animal Group Names Deadliest Animals Quiz Read Next Do We Really Swallow Spiders in Our Sleep? 9 of the World’s Deadliest Spiders Discover 12 Greek Gods and Goddesses Vietnam War Timeline 10 Important Dates in Pluto History 9 of the World’s Deadliest Spiders 10 Failed Doomsday Predictions What Do Eggs Have to Do with Easter? Why Do Some Cicadas Appear Only Every 17 Years? Contents Home Science Bugs, Mollusks & Other Invertebrates Arachnids Internal features