Jellyfish could be much smarter than scientists previously thought, asserts a new study published in the journal Current Biology. Here's what researchers discovered about the workings of their brains.

Box jellyfish, Portuguese man-of-war, lion’s mane and sea nettle are among highly venomous jellyfish species whose stings require immediate medical attention, per UF Health.

“I never thought that jellyfish could really learn.” The Caribbean box jellyfish’s four rhopalia (circled) each have six eyes and about 1,000 neurons to process what they see.

But like other jellyfish, they are brainless, controlling their cube-shaped bodies with a distributed network of neurons. That network, it turns out, is more sophisticated than you might assume.

Caribbean box jellyfish, animals that may appear to float through life aimlessly and don’t have a central brain, still have the ability to learn rapidly and retain information, new research has ...