In a classroom that spans the world's oceans, from Alaska's herring-rich coastline to Antarctica's feeding grounds, humpback calves learn their family's traditions. Cooperative hunting strategies, the longest migrations of any known mammal and communicating through complex songs to find a mate are all lessons absorbed by the younger generation. Director: Brian Armstrong. Actors: Sigourney Weaver (Narrator), James Cameron (Self), Nan Hauser (Self), Brian Skerry (Self), Andy Szabo (Self) (2021)