There are hundreds of urchin species, and they’re found in every ocean on Earth, from the intertidal zone to more than four ...

The deep sea refers to the part of the ocean below 200 meters (656 ft.), at which light begins to disappear. Despite making ...

Tucked under the stones and shells of the shallow waters off Spain, one creature has the ability to completely alter its size. Up to nearly 10 inches long, the animals have the ability to contract ...