John Calambokidis, who began recording information on the blue whale population in California in the 1980s, shares exciting recent discoveries on this species. Calambokidis explores the movements and behavior of this species and shows new video footage taken from a "Crittercam" on a blue whale as it feeds and vocalizes underwater. For decades after blue whales were commercially hunted, many feared that their numbers had been reduced to the point that made extinction inevitable. However, off the California coast, recent research has revealed a surprisingly large blue whale population.