Animal MigrationsAge range 6 to 9 A reindeer treks a continent under unimaginable weather extremes. One tiny bird flies non stop for nine days, while another flies from the north to south pole (and back!) every year. A whale swims around an entire hemisphere. Animal Migrations: Flying, Walking, Swimming offers a fascinating insight into the what, where, why and how of these incredible journeys of survival. It explores the migrations of mammals, birds, insects, fish,