Sea turtles, meanwhile, saw huge declines due to the oil spill, with an estimated death toll of 4,900-7,600 large juvenile and adult sea turtles and 56,000-166,000 small juvenile sea turtles.

TAMPA, Fla., May 20 (Reuters) - A record dolphin die-off in the northern Gulf of Mexico was caused by the largest oil spill in U.S. history, researchers said on Wednesday, citing a new study that ...