Dr. Universe: Why can’t sea turtles pull back into their shell? I was at the St. Louis Zoo, and they said tortoises and other turtles can pull back into their shells. – Tyler, 7, Missouri There are ...

Loggerhead sea turtles migrate thousands of miles through the world’s oceans, but they don’t travel solo—research shows they carry surprisingly diverse and abundant populations of tiny creatures on ...

The biggest turtle ever described wasn’t an ancestor of today’s leatherback turtles or any other living sea turtles. But it looks like there are some things about being a giant, skin-shelled sea ...

The ocean has always called to us with its rhythmic waves, endless mysteries and treasures scattered along the shore. Most of us are drawn by the glimmer of a seashell, a tiny piece of the sea we long ...

Greenpeace scientists have identified a dense patch of deep-sea corals in a lease area of the Arctic's Chukchi Sea off Alaska's northwest coast, where Royal Dutch Shell is slated to start drilling.