This satellite image taken Thursday shows the oil slick in the Gulf of Mexico as it nears the shoreline, threatening wildlife along Louisiana's fragile islands and barrier marshes. NASA/AP hide caption

itoggle caption NASA/AP

Tendrils of oil leaked from the Deepwater Horizon wellhead marred the waters of the Gulf of Mexico in this satellite image. An estimated 5,000 barrels of oil a day are seeping into the Gulf. DigitalGlobe hide caption

itoggle caption DigitalGlobe