Danene Birtell, left, and Lisa Pittman with Wildlife Response clean and take vital signs of a Lesser Scaup duck in Baytown, Texas. (Thomas Shea / Getty Images)
An oil-covered Lesser Scaup duck is examined at Wildlife Response in Baytown, Texas. (Pat Sullivan / Associated Press)
A dead oil-covered bird on the shore near the spill site. (Melissa Phillip / Associated Press)
Houston Audubon members watch for oiled birds at the Bolivar Flats Shorebird Sanctuary in Bolivar, Texas. (Melissa Phillip / Associated Press)
Workers clean up oil from East Beach in Galveston, Texas, earlier this week. (Thomas Shea / Getty Images)
Cruise ships sit at anchor in the Port of Houston, unable to leave after an oil spill in the Houston Ship Channel. (Thomas Shea / Getty Images)
