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 6 Cultures That Recognize More than Two Genders How Do Tornadoes Form? 6 Classical Dances of India New Seven Wonders of the World What’s the Difference Between a President and a Prime Minister? 6 Animals We Ate Into Extinction 9 American Political Scandals Contents Home Science Bugs, Mollusks & Other Invertebrates Arachnids Internal features Table of Contents