By NOAA Alaska Fisheries Science Center To locate endangered North Pacific right whales, scientists listen for their calls in Alaskan waters believed to be a part of their historical feeding grounds. To do this, scientists use underwater microphones, known as hydrophones. The NOAA Fisheries/University of Washington scientific team documented sounds from these rare right whales at all six acoustic mooring sites in the Aleutian Island passes and northern Gulf of Alaska.
