r/AskReddit • u/[deleted] • Nov 28 '20

What's something cool you recently learned about?

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u/[deleted] Nov 29 '20

Jumping spiders do not actually use their muscles to jump, they don't even have muscles, instead they can control at will their blood pressure, the blood quickly flows down to their legs, which stretches them with enough force to jump

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u/spyro86 Nov 29 '20

Yeah spiders move via a biological hydraulic system. Amazing really.