Off the western coast of Mexico, a "transparent" sea creature with horn-like appendages swam through the water, or it tried to at least. But something caught it and pulled it toward the surface.

The sea walnut, a type of comb jelly that has become invasive in parts of Europe and Asia, can transform from a sexually mature adult back into its larval form when times are tough. When you purchase ...

Explore the mesmerizing world of transparent marine life, where creatures like the glass octopus, glass squid, and barreleye fish reveal the ocean's hidden wonders. These see-through animals use their ...