A baby blue whale filmed off Costa Rica may be the first to have been photographed underwater and adds to evidence that a blue whale hot spot is a birthing ground. With video.

A newly designated conservation area in Papua New Guinea will help preserve pristine forests as habitats, homes for villagers, and carbon sinks.

What causes rare "thundersnow" storms like those that struck the U.S. Southeast this week? How do they spark heavier snowfall? And where can you see them? Experts explain.

Scientists have long believed the moon to be a dead world. But observers have reported seeing intermittent bright flashes there for the past 400 years. Could these be signs of geological activity?

Microchip-implanted penguins in Argentina are helping scientists by just doing what comes naturally on the birds' favorite "highway" to the sea.

Linguists in India are scrambling to save some of the country's nearly 700 languages before they fade in the face of globalization.

A giant stingray—weighing more than 550 pounds—gives scientists hope that this once endangered megafish is more abundant than previously thought.

Some 2,000 years ago, a ship laden with marble blocks sank off the coast of modern-day Turkey. Nautical archaeologists have found the stones' source and destination.

It's well known that animals can give diseases to humans. But now the first known case of humans transmitting a disease to wildlife is being analyzed in Africa.

It's well known that animal diseases can be transmitted to humans. But a veterinarian is studying the reverse: wild mongooses infected with human tuberculosis in Botswana.

Mastiff dogs are becoming increasingly popular in Spain to protect cattle from a growing wolf population.

After the recent chimp attack in Connecticut, a Florida sanctuary's work is more pertinent than ever. The facility treats pet primates that have been abused or abandoned.

Underwater archaeologists in Florida have discovered secrets from a time when wooly mammoths, giant sloths, and huge tortoises roamed a landscape quite different from today's sunshine state.

On an unprecedented Congo River run, scientists and kayakers have found potential new species, spike-toothed "monster fish," and evidence that the African river may be the world's deepest.

Archaeologists digging at the site of George Washington's early home have discovered clues about the boyhood of the first U.S. President.