Environmentalists rescued some 20 penguins covered in crude oil off Argentina's mid-Atlantic coast, two of which have died and four are in critical condition, the Patagonia Natural Foundation (FPN) has said. The Magallanes penguins were found far from their natural habitat for this time of the year, and were severely undernourished and suffered from dehydration, the environmental group said. FPN coordinator Carla Poleschi said the topmost concern was cleaning the birds thoroughly and feeding them back to good health. "If they manage to survive, they'll be released in about 40 days so they can carry on with their lives' in the Atlantic Ocean, she said. The penguins were found off the coast of the Valdes Peninsula, a 36,000-hectare nature preserve listed as a UNESCO World Heritage Site.