How did whales evolve from land-dwelling mammals into the largest animals on Earth—and why are so many of them found in Antarctica? Expedition Leader Lianne Thompson explores the remarkable evolutionary journey of whales, from their ancient origins to their modern role in the Southern Ocean. Along the way, discover the difference between baleen and toothed whales, learn how Antarctic krill and the Antarctic Circumpolar Current support an abundance of marine life, and meet some of the whale species that make Antarctica one of the world's premier wildlife destinations.