The box jellyfish is famous for its venom, but its bizarre collection of 24 eyes may be even more remarkable than its sting.

One of the biggest mysteries of evolution is how species first developed complex vision. Jellyfish are helping scientists solve this puzzle, as the group has independently evolved eyes at least nine ...

For three summers in a row, researchers working in the Mai Po Nature Reserve noticed something unusual drifting through the brackish shrimp ponds. At first glance, the small, translucent animal looked ...

If jellyfish need sleep to keep their nerve nets intact, the need to sleep probably predates the evolution of brains, eyes, and even bodies that are the same on both left and right sides. In ...

An upside-down jellyfish drifts in a shallow lagoon, rhythmically contracting its translucent bell. By night that beat drops from roughly 36 pulses a minute to nearer 30, and the animal slips into a ...