Large seabird colonies have a surrounding boundary known as Ashmole's halo, where food sources are depleted, forcing the ...

Add Yahoo as a preferred source to see more of our stories on Google. Pumas are now preying on Patagonia’s coastal penguin colonies at high rates, raising new conservation concerns. Rising puma ...

Since cattle ranching was abandoned in southern Argentina in 1990, pumas (Puma concolor) have been recolonizing their historical ranges in this area. For the first time, this brought them into contact ...

Along South America's windswept southern coast, Magellanic penguins have spent decades nesting in relative safety. For much of the twentieth century, sheep ranching dominated the region, and pumas ...