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 ...

Box jellyfish are named for their “cube-shaped” bodies, researchers said. This group of jellyfish contains “some of the most venomous marine animals in the world.” ...

Box jellyfish do not have brains — yet, a new study shows they are still capable of learning. Researchers over time managed to train box jellyfish to avoid obstacles in a low-light environment.

A diagram of the Tripedalia maipoensis jellyfish showing six of the animal’s eyes. The abbreviation ‘le’ means “lower lens eye,” ‘pe’ means “pit eye,” ‘se’ means “slit eye ...