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 ...

Jellyfish: Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria. Jellyfish ...