Colorado wildlife officials have released 15 gray wolves that were captured in Canada in order to help create a permanent population. NBC News'  Steve Patterson has more on the conservation efforts.

Incredible photos of a whale and a dolphin “surfing” together very close to the north Cornwall coast have been captured on camera.

Once hunted to the brink of extinction, the humpback whale population has recovered extensively over the past half a century.

The Atlantic humpback dolphin (Sousa teuszii) is among the poorest understood oceanic mammals. There is a lack of historical ...

Whale sharks use both natural and artificial underwater features, such as seamounts and oil platforms, as stepping stones in ...

California Condor: This bird was brought back from the edge of extinction through captive breeding programs and reintroduction into the wild. Przewalski's Horse: Once extinct in the wild, this horse ...

Traditionally, the whales move around the western side of Britain but some are now swimming down the east coast and through ...

Scientists are surprised by the increasing presence of humpback whales in the waters off the coast of Great Britain. Experts ...

Scientists are surprised by the increasing presence of humpback whales in the waters off the coast of Great Britain. Experts ...

Cetaceans—marine mammals that include dolphins, porpoises, and whales—are crucial to coastal ecology. Their presence fosters ...

There are five types of killer whale in Antarctica, but only three found in these waters, near the peninsula south of South ...