The critically endangered whales are also not typically found this far south during this time of year. There are fewer than 400 North Atlantic right whales remaining, making every sighting significant. Because of these risks, officials said seeing right whales in a busy shipping corridor is a major concern. This led to the North Atlantic right whale being listed as endangered under the Endangered Species Act since 1970. 2 ENTANGLED RIGHT WHALES SPOTTED OFF COAST OF MASSACHUSETTSOfficials are now reminding boaters and the public to report any North Atlantic right whale sightings.