From the NOAA incident news (http://www.incidentnews.gov/attachments/8220/527747/DeepH20web_26May.pdf)
Marine mammals and turtles (effective May 25):
The total number of sea turtles verified from April 30 to May 25 within the designated spill area is 223. The 223 includes three entirely oiled sea turtles that were captured alive during dedicated on-water surveys last week: two small Kemp's Ridley and a larger sub-adult Loggerhead turtle. They were taken to the Audubon Aquarium where they are undergoing de-oiling and care and are doing well. In addition, 207 dead and 13 live stranded turtles (of which three subsequently died in rehab) have been verified. None of the dead or alive stranded turtles have had visible evidence of external oil.
From April 30 to May 25, there have been 22 dead dolphins verified within the designated spill area. The dolphin collected on May 24 is being evaluated. The other 21 dolphins have had no visible evidence of external oil.