A deadly synergy between HIV and malaria appears to be fueling the spread of both diseases in Africa, where 4 million people die from the illnesses each year.

Urban birds sing higher, shorter songs than forest-dwelling birds of the same species, likely to compete with traffic and other background noise, a new study says.

Gene Simmons, eat your heart out. A newfound bat's tongue can stretch to one and a half times the length of its body, and now scientists think they know why.

Weblogs from dangerous regions of Africa, Borneo, and beyond are allowing isolated rangers and other conservationists unprecedented lifelines to each other and the outside world.

U.S. officials are looking in the wrong place to stop bird flu, suggests a new study, which questions the usefulness of testing Alaskan birds migrating from Russia.

Southern right whales are coming under increased attacks from an unlikely predator: seagulls hungry for the mammals' skin and blubber.

A landslide on Mount Etna triggered killer waves along the Mediterranean coast from Italy to Egypt, likely wiping out entire Stone Age settlements, a new study says.

This week: Al Gore interview, wasps' "pepper spray" weapon, pre-Inca tomb discovery, chemical secret of Stradivarius violins, new butterfly species, and more.

Miners and tourists alike are contaminating Argentina's caves, say scientists, who warn that fragile underground ecosystems and archaeological sites are at risk.

Extreme rains, interspersed with droughts, could spell disaster for the country's agriculture-based economy, according to research spanning five decades of data.

Not a single hurricane hit the Atlantic Coast this season because of a combination of unusual weather conditions, experts say.

Go in the field with biologists studying how lemurs are coping with habitat loss, and meet the unusual creature they encounter that could be a new primate species.

Seafood lovers may risk the ire of conservationists to land a Chilean sea bass, but fishers brave raging winds and frigid seas to bring the fish to market.

Too much carbon dioxide in the atmosphere could create hazards for low-orbiting satellites that power global positioning systems, new research suggests.

Frogs, butterflies, polar bears, and penguins are dying out from climate change much faster than researchers had previously expected, a new study shows.