A modern-day walking bat in New Zealand did not evolve its unusual habit, but instead retained it from an ancestor, a new fossil found in Australia shows.

In the Washington, D.C., area, acupuncture is becoming a more popular option for treating a variety of animal ailments, from arthritis and nerve damage to constipation. Video.

Two spiders sported adaptations that helped them survive the brutal beginnings of earthly life, new 3-D imaging shows.

A seal hunter bloodies the waters, models strut the world's longest catwalk, mourners remember Hiroshima, and more in this week's best news photos.

Just as Hercules had the multi-headed hydra to contend with, ocean predators tussle with two-headed sea snakes—or so it appears.

Like Bruce Wayne switching to his Batman voice, orangutans may be going deep to deter predators, and some are even using tools to sound more intimidating, a new study says. With audio.

A new dink frog discovered in southern Costa Rica sports different colors depending on its age and sex—a rare trait among frogs, a new study says.

"We don't think they are poisonous, but they certainly taste bad," an ecologist says of Australia's corroboree frog, an endangered species that has now been successfully bred in captivity. Video.

Denture wearers take note: Science is one step closer to growing replacement teeth. For the first time an honest-to-goodness tooth has grown from stem cells in a jaw.

Although previous clues had hinted that the dog-human bond was forged in East Asia, new evidence suggests that exactly where dogs were first domesticated remains a doggone mystery.

New genetic analysis suggests the deadly parasite mutated from a chimpanzee strain—and hints that similarly long-lasting diseases are today making the leap from animals to people.

A loggerhead sea turtle seemingly injured by a shark was recently fitted with "trial" prosthetics as part of efforts to give the rare animal fully functioning flippers. Video.

An Irish snorkeler gets bogged down, a Japanese polar bear takes a plunge, a bridge collapses in quake-ravaged China, and more in this week's best news photos.

Predicting global warming may have just gotten even harder. The swimming of ocean creatures may be as effective as winds or tides at ocean mixing—a process that plays a major role in shaping Earth's climate.

A new swarm of giant jellyfish is building up off China's coast, and experts are warning fishers in Japan to brace for an inundation like the one that devastated their catch in 2005.