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Most nature sites will tell you the deadliest spider is the Sydney Funnel-Web Spider, and it’s hard to disagree due to it’s neurotoxic venom… but here at CritterScore we weigh up multiple specs to decide who ranks top of such lists. 

Whether it’s Mass, Dimensions, and Territorial Dominance for the ocean’s heavyweights or Venom, Aggression, Delivery, and Encounter Risk for the world’s most toxic biters, we break down the biological “specs” that put these creatures on the ranking leaderboard.

You’ll find a bunch of fun facts about all the critters we rank – did you know that any predator that bites the African Crested Rat rat receives a mouthful of poison that causes heart failure?

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Top 10 Deadliest Spiders →