BUENOS AIRES,  - 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) said Sunday. 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 private, non-profit environmental group said in a statement.  The group did not explain how the penguins got coated in crude oil. 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 (139 square miles) nature preserve renown for its whales, walruses, penguins, birds, guanacos and other species, listed as a UNESCO World Heritage Site.