This video says about itself:
18 December 2014
Scientists from WCS (Wildlife Conservation Society), the Universidad Austral de Chile, the Blue Whale Center, the American Museum of Natural History (AMNH), NOAA, and other organizations are examining molecular clues to answer a big question: how many types of blue whales exist in the waters of the southeastern Pacific?
The answer seems to be two distinct populations, according to a genetic study comparing the blue whales off the southern coast of Chile with those swimming in the waters of Antarctica and other nearby regions. Learn more from Dr. Howard Rosenbaum, Director of WCS’s Ocean Giants Program. Images courtesy of Rodrigo Hucke-Gaete (CBA/UACh).
See also here.