In the cold, dark depths of the North Atlantic and Arctic Oceans swims one of the planet’s most mysterious and ancient creatures. The Greenland shark, a sluggish predator with a ghostly gray body and ...

The International Union for Conservation of Nature categorizes the tope shark as critically endangered. The species is highly threatened with extinction because of commercial overfishing for liver oil ...

In the heart of French Polynesia, a narrow channel carves its way through the Fakarava Atoll, connecting a vast lagoon to the open ocean. To the casual eye, it's a beautiful stretch of turquoise water ...