It's a showdown between two of the world's most dangerous desert hunters: a red-tailed hawk and a diamondback rattlesnake. Who will win this battle of the predators?

Global warming may give caterpillars a break from their natural enemies, freeing the caterpillars to devour crops and forests, scientists say.

Hunting season has reopened on Yellowstone National Park's bison for the first time in 15 years. Will this controversial step help control livestock disease?

Urban gardeners planting choices may play an important role in bee diversity, according to a new study.

Watch as a team of scientists uncovers some surprising facts about Antarctic penguin colonies and their fight for survival in a fast-changing icescape.

Microchip identification technology is credited with reuniting thousands of pets with their families. But incompatible products have ignited controversy over setting national standards for the devices.

Novel GIS analysis of lemur teeth shows that infants born to older mothers with worn-out teeth can survive, as long as they are born during the wet season.

Wildlife is becoming "globalized," biologists warn, as the spread of animals and plants makes species more homogenous at the expense of regionally unique varieties.

Researchers have unearthed fossil evidence of a new species of ancient crocodile that had a head like a carnivorous dinosaur and a tail like a fish.

The high cost of treating human wastewater may one day tank thanks to bacteria that consume ammonia and produce rocket fuel.

Watch an underwater filmmaker come face to beak with the Humboldt squid, a deep-sea giant so ferocious it's known as the red devil.

In the Ice Age, California condors feasted on seals and whales. Could a return to that diet help the birds bounce back?

Scientists say giant icebergs may explain why Adélie penguins have experienced genetic microevolution over the past 6,000 years.

With its staccato call, the Atlantic croaker sounds more like a frog than a fish. Why the loudmouth croaks when and where it does, however, is a mystery.

Medieval lion and leopard skulls found in a Tower of London moat are revealing secrets about big cats kept inside the English royal palace, researchers say.