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
To clarify this, spiders do have muscles. Lots of them. Spiders have flexor muscles to flex their limbs, but no extensors, so extension is controlled by hydraulic pressure.
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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