Reuters: For the birds that nest in the fragile marshes, swamps and barrier islands of the U.S. Gulf Coast, the timing of a massive oil slick threatening the shore could not be worse. On the Chandeleur Islands — a chain of islands off the Louisiana coast where an oil spill from last month’s offshore oil rig explosion could hit shore as early as Tuesday — about 3,000 brown pelicans, Louisiana’s state bird, are nesting and laying eggs. “They are right in the middle of having eggs …