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By Melissa Gaskill of Nature magazine Heart-breaking pictures of seabirds covered in black crude oil, arresting as they are, can miss the hidden story of an oil spill's impact on wildlife. Exposure to even tiny concentrations of the chemicals present in oil can also cause harmful biological effects that usually go unnoticed, according to a study published today in Proceedings of the National Academy of Sciences .

By Melissa Gaskill of Nature magazine The 1,000 kilometers of impenetrable barrier constructed along the Mexico-United States border, with the aim of stemming illegal human immigration, is also hampering the movements of animals, including several endangered species, a recent study finds. The species most at risk are those with smaller populations and specialized habitats, says Jesse Lasky, a graduate student at the University of Texas, Austin, and an author on the study, published in Diversity and Distributions

By Melissa Gaskill of nature magazine More than a year after the Deepwater Horizon disaster gushed oil into the Gulf of Mexico, scientists say that they have been struggling to gain access to the region's rigs and drill ships, hampering their research.

By Melissa Gaskill of Nature magazine There is only one official source of data on pollution caused by offshore drilling in U.S. [More]