Two fossil finds in China suggest that prehistoric mammals were bigger and badder than previously thought. At least one even ate dinosaurs for dinner.

Lions in the Tsavo region of southeastern Kenya are prone to prey on livestock during the rainy season: Researchers hope the finding can help ranchers—and save lions.

The tides of Atlantic salmon that flooded many European and North American rivers last year may signal efforts to restore the fish are working, activists say.

Locust plagues may predate biblical times, but today scientists still struggle to fully understand and control the swarms that can bring famine to thousands.

The great tsunami of 2004 was one of the worst disasters in history. Read our latest news stories and learn how tsunamis are generated, where they can strike, and what you can do to protect yourself.

They might not actually count the calories, but spiders and predatory insects actively seek a balanced diet, according to a new study.

While some 150,000 people were killed by last month's tsunami, few animals seem to have been caught off guard. Do animals have a sixth sense about such danger?

Birding columnist Mathew Tekulsky "baits" a white-breasted nuthatch and watches—and photographs—the bird stashing the food in a hiding place.

No other birds fly as stealthily as owls. Now flight engineers are researching owl-feather-inspired technology to build quieter aircraft.

Resuming fieldwork in Iran after a 20-year hiatus imposed by the Islamic revolution, Swedish zoologists have discovered ten new lizard and snake species.

Forget GPS, forget road signs. Researchers in England say foraging Pharaoh's ants employ a simpler means to find their way home: geometry.

In a global conservation study, scientists are hunting for the world's largest freshwater fish. The current record holder? A 660-pound (300-kilogram) catfish.

Wild populations of Australian dingoes may go extinct within 50 years unless steps are taken to prevent crossbreeding with domestic dogs, scientists and conservationists say.

While crows have a reputation for being clever birds, research now suggests they could be as intelligent as great apes.

Perhaps the most heat-tolerant complex organisms on Earth, Pompeii worms burrow into the sides of hydrothermal vents found deep in the Pacific Ocean. Scientists hope to learn how the worms survive their hellish home.