After centuries of colonization and trade, South Africa is now home to alien species from Australia, Europe, Asia, and the Americas. As an antidote, a pioneering program called Working for Water (WfW) has cleared about 1 million hectares of invasive species in the past 15 years.

The U.S. Food and Drug Administration (FDA) is on the cusp of gaining power for the first time to regulate cigarettes and other tobacco products. Last week, the U.S. Senate followed the lead of the House of Representatives, voting 79

An outbreak of cholera in Zimbabwe has crossed the country's borders and is creating "an extraordinary public health crisis," outside experts say.

In the wake of severe fighting in Virunga National Park in the Democratic Republic of the Congo, worried rangers began a painstaking census late last month of the park's highly endangered mountain gorillas, nearly a third of the world's known population.

The axolotl, a salamander that retains unique evolutionary features and is a darling of biologists because it can regenerate limbs, faces adversity on two fronts.