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 Animal Group Names Deadliest Animals Quiz Match the Baby Animal to Its Mama Quiz Creepy Crawlers Quiz Animal Factoids Read Next 9 of the World’s Deadliest Spiders Do We Really Swallow Spiders in Our Sleep? Discover 9 of the World’s Deadliest Spiders 7 Surprising Uses for Mummies 7 Deadliest Weapons in History Titanosaurs: 8 of the World's Biggest Dinosaurs Why Is the Indy 500 Held on Memorial Day Weekend? Does Ball Lightning Exist? Why Do Bananas Turn Brown? Contents Home Science Bugs, Mollusks & Other Invertebrates Arachnids Internal features Table of Contents