See a roundup of the week's news and events: Indonesia's Mount Gamkonara rumbles, snow falls in Buenos Aires after 89 years, Boeing launches its 787 Dreamliner, and more.

An ancient jawbone found in Ethiopia could rekindle the debate about how many species of human ancestors roamed East Africa three to four million years ago.

Fleshy corals are vanishing as bleaching events intensify, experts warn, noting that entire species could go extinct before they are even discovered.

In less than five years, a Pacific butterfly has developed defenses against a parasitic bacterium, showing evolution can move at "warp speed," scientists say.

When a baby beluga whale accidentally beaches itself on an Arctic shore, every hour counts. Will the life-saving tide return in time to save the calf?

See top shots from this year's edition of Spain's breathtaking, bone-breaking running of the bulls-and get the story behind the centuries-old tradition.

A six-month-old baby mammoth found in Russia's remote Siberian north is the best preserved example of the species ever recovered.

At least one affected region reports killing 90 tons of rats in an effort to curb a rodent invasion, linked to recent flooding, that is ravishing crops and threatening public health.

One of the largest giant squid ever found washed up on a beach in southern Australia yesterday, offering potentially crucial clues to the animal's habits and habitat.

The love life of an unusual African fish has been revealed—mates engage in electrical "duets" when they feel the spark of romance, a new study finds. With audio.

A rare species of squid, dubbed "octosquid" because of its eight tentacles and squidlike body, has surfaced through a deep-sea pipeline in Hawaii.

See Crittercam footage and ride underwater with a pod of whales that work together to form a net of bubbles.

See a roundup of the week's news and pictures: floods in Mumbai, an annual pilgrimage in Belarus, China's Qiandao Lake, and more.

Adventurers exploring a cave on an island in the Indian Ocean have discovered the most complete and well preserved dodo skeleton ever found, scientists announced.

The world's largest group of gray-shanked douc langurs, among the world's most endangered primates, was found thriving in the forests of central Vietnam.