Delphinidae afsc.noaa.gov National Marine Mammal Laboratory afsc.noaa.gov 50 to 80 years http://www.afsc.noaa.gov/nmml/education/cetaceans/killer.php National Marine Mammal Laboratory Killer Whales Killer Whales (afsc.noaa.gov) Killer whales National Oceanic and Atmospheric Administration afsc.noaa.gov National Marine Mammal Laboratory afsc.noaa.gov afsc.noaa.gov afsc.noaa.gov killer whales afsc.noaa.gov afsc.noaa.gov actually large dolphins afsc.noaa.gov afsc.noaa.gov National Oceanic and Atmospheric Administration NOAA