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 9 of the World’s Deadliest Spiders Do We Really Swallow Spiders in Our Sleep? Discover What Causes the Northern and Southern Lights? New Seven Wonders of the World Timeline of the 2000s Timeline of the 1990s Vietnam War Timeline What’s the Difference Between a President and a Prime Minister? How Did Helen Keller Fly a Plane? Contents Home Science Bugs, Mollusks & Other Invertebrates Arachnids Internal features Table of Contents