The "remarkable," yard-long, horseshoe crab-like arthropods roamed in swarms of up to a thousand animals, a new study suggests.

From embryonic wasps that mature inside "brainwashed" caterpillars to developing sharks with "superhuman" senses, see pre-birth pictures of animals that have extreme adaptations to the rigors of gestation.

A four-legged quake survivor gets help, police find an ancient Hebrew document, Bolivia's Indians engage in ritual fistfights, and more in this week's selection of the best news photos.

Meet the animal world's "worst" mothers—and find out why their tough parenting may not be so awful after all.

See boxer crabs, "flying" squid, a fish with a mouthful of babies, and other stars of a marine science school's annual amateur underwater-photo contest.

Given away by bird poop on his socks, a man was charged Tuesday in California with smuggling exotic Asian songbirds from Vietnam into the United States.

Toxic gases have been continually erupting from the fast-growing Pacific volcano since 2004, a new expedition reveals. But some odd new animals seem to like it just fine.

The surprise find doubles the number of frogs and other amphibians in the island country, and suggests "the century of discoveries has only just begun," scientists say.

See a sharp young Martian crater, a gaggle of galactic colors, a "river" of stars, and more in the week's best space pictures.

Dexterous enough to grasp a heavy can of food or a raw egg, the unique, air-powered machine may someday be used in prosthetics or other scientific research. With video.

See shining plastic people, ballplayers, and empty flights to Mexico City in these glimpses of life around the globe.

Two tiny new species of frogs, including the "extremely shy" tiny toadlet, have been discovered in a species-rich region of Australia.

The fossils, which contain the only known extinct seahorse species, shed light on the mystery of how the poor swimmers were able to disperse across the globe, scientists say.

Scientists have snapped the first ever portrait of H1N1, the swine flu virus that has swept the globe in recent weeks.

Three thousand years ago, a fortified city on Egypt's border was both a warning to invaders and an awe-inspiring gateway for travelers--as evidenced by newly revealed grand temples and rare cravings.