Bringing new meaning to the phrase "see you later, alligator," a new study suggests that female American alligators frequently return to their previous sexual partners.

From "cannibal" water beetles to blind cave eels, hundreds of newfound subterranean animals have revealed unexpected diversity in the dry Australian outback.

A leaping wolf, a feisty pet cat, and two playful Amazon dolphins feature in some of the winning pictures from this year's Veolia Environnement Wildlife Photographer of the Year competition.

In the wilds of northern Minnesota, bear expert Lynn Rogers teaches participants at a "wild encounters" camp about bear language, manners, and lifestyle—all while getting up close and personal with wild black bears. Video.

Putting a new spin on the term "nuclear waste dump," radioactive droppings from Cold War-era critters have spurred a high-tech cleanup funded by the current U.S. government economic stimulus program.

Weighing in at fewer than two pounds, the Chihuahua-size dinosaur Fruitadens haagarorum was an agile omnivore, a new study says.

The female of the new golden orb-weaver species Nephila komaci has a leg span of up to five inches—about ten times larger than the male—say scientists who found the giant web-spinning spider.

Police in Australia say a blood-engorged leech, through DNA testing, led them to a man responsible for the robbery eight years ago of a 71-year-old woman.Video

Only an alligator could truly understand the allure of this thunderous "chorus." But a new study says the song may be an invitation to reptilian romantic networking.

Without having been trained to do so, chimps in a Japanese study helped their fellow apes access elusive juice. The researchers say this adds to evidence that chimps are more similar to humans than previously thought. Video

A steam-shrouded bison, a bikini-clad diver, a seven-year-old shepherd, and other wild wonders stalk our selection of winning pictures from the latest Banff Mountain Photography Competition.

It's only a matter of time before swine flu jumps to U.S. pigs, experts say. Scientists say H1N1 could strengthen while in the animals, while farmers—already battered by the perception that pork is unsafe—fear even worse sales.

Giant alien snakes--some of which have been known to kill humans--could easily colonize Florida and other parts of the United States, a new report says.

Nine giant snakes could be on the verge of causing ecological catastrophe if they establish themselves in the U.S. wild—at least two have already set up shop in Florida—according to a new report.

A newfound fossil predator, which may have hunted other flyers, is a hodgepodge of older and more modern flying reptiles, scientists say, bridging a gap in pterosaur evolution.