Learn how extreme longevity and deep-sea adaptations allow Greenland sharks to preserve vision for centuries.

Sharks are some of the ocean's top predators. In fact, sharks and their relatives were the first vertebrate predators on Earth. Shark fossils date back more than 400 million years -- that means sharks ...

The Greenland shark, a slow-moving giant of the North Atlantic and Arctic Oceans, holds the record as the longest-lived ...