In this visual illusion picture, a jellyfish is hidden in plain sight among the plastic bags. Only the sharpest eyes can spot ...

an isolated photoreceptor will do. Hydra, a small relative of jellyfish, has no eyes, but it does have photoreceptors in its body. Todd Oakley and David Plachetzki from the University of ...

In other words, jellyfish do not have mouths with teeth, nor do they have noses. Box jellyfish, which scientists do not consider true jellyfish, do have eyes — but they don't resemble the ones shown ...

Box jellies are highly advanced among jellyfish. They have developed the ability to move rather than just drift, jetting at up to four knots through the water. They also have eyes grouped in ...

Jellyfish have survived for over 500 million years, making them more ancient than the dinosaurs. Today these otherworldly creatures can be found around the world, from coastal shallows to the ocean ...