It was capable of growing beyond 30 feet in length and weighed around 10 tons—a mature elephant plus a sedan car.

From deep-sea sponges to ancient tortoises, the longest-living animals can survive for centuries, even pausing aging.

Marine scientists have captured images of a mysterious tentacled creature that lives more than 3 miles below the ocean surface.

The Great Barrier Reef is a special place. It’s a coral reef wonderland that’s home to more than 2,900 individual reefs and 9 ...