Few people know that the blue whale is the largest animal to have ever lived, even bigger than the largest dinosaurs. It once had four legs and lived on land. Andreas Tjernshaugen and Line Renslebråten take us into the fascinating world of blue whales, between the ocean floor and the water's surface. Together with a blue whale mother and her calf, we embark on a journey through the depths of the ocean, searching for the next swarm of krill or watching as the young blue whale learns to breathe through the two blowholes on its head—a moment that whale watchers eagerly anticipate. It's hard to believe that we humans nearly drove this fantastic creature to extinction!.