All of the mammals begin their annual migration to avoid the winter. Sid the Sloth's family leaves without him, as they do every year, while Manny the Mammoth migrates in the opposite direction to avoid the warm weather.
Beakman explains what migration is and uses a video clip of geese flying south. He then talks about a variety of animals that migrate for a variety of reasons. He then explains who they know when and where to migrate.