FILE - In this April 10, 2008 file photo, the head of a North Atlantic right whale peers up from the water as another whale passes behind in Cape Cod Bay near Provincetown, Mass.  Federal officials plan to provide more details on their investigation into the recent deaths of endangered North Atlantic right whales. The whales are among the rarest marine mammals in the world. Only about 500 right whales exist. At least 13 right whales were found dead this year off New England and Canada. More details on the investigation are to be released Friday, Aug. 25, 2017. (AP Photo/Stephan Savoia, File) Photo: Stephan Savoia, STF / Copyright 2016 The Associated Press. All rights reserved.