How intelligent are jellyfish?

The skyward gaze of one set of eyes belonging to box jellyfish provides evidence that these creatures -- which lack a conventional brain -- are capable of sophisticated behavior. New research has shown that one species of jellyfish uses one set of eyes to navigate and keep itself close to home. read more

Jellyfish have a decentralized nervous system (nerve net) coupled with a variety of relatively sophisticated sensory organs to detect light, orientation, salinity and physical stimulus and they can respond in a rapid and coordinated manner to these stimuli [1]. read more