Jellyfish are not just passive ocean drifters
Jellyfish actively propel themselves by pulsing their bell-shaped bodies, allowing them to navigate currents and play a vital role in marine ecosystems, inspiring modern robotics.
Jellyfish actively propel themselves through the ocean by rhythmically pulsing their bell-shaped bodies, expelling water to move forward. This jet propulsion, powered by simple nerve nets, allows them to navigate currents for feeding, escaping predators, and mating, dispelling the myth that they are entirely passive. Having existed for over 500 million years, these ancient creatures demonstrate remarkable evolutionary efficiency without bones or complex organs. Their active movement helps distribute nutrients and influences marine food webs, with some regions seeing jellyfish comprise up to 40% of zooplankton biomass. This simple yet effective propulsion has even inspired soft robots for underwater exploration.