Researchers have mapped the distribution of a jellyfish subspecies and found that creatures which lack a distinctive "knob" are somehow prevented from leaving the Arctic.

There are so many different types of jellyfish out there, boasting different sizes, shapes, colors, and more. The immortal ...

It doesn’t look like much at first—barely the size of a lowercase letter on a keyboard. But that sliver floating in open water is the start of a swordfish. Although it can fit on your fingernail at ...