Show of the week: Great Migrations

Dazzling high-def footage shot on all seven continents reveals animal migration in all its variety in this seven-part series. The core pair of two-hour episodes, airing separately Nov. 7 and 14, feature dramatic footage of red crabs, wildebeests, butterflies, sharks, zebras, and many other species racing against time to breed, eat, and survive. Additional hours include “Science of Great Migrations” (Nov. 9); “Behind the Scenes” (Nov. 14 ); and “Rhythm of Life” (Nov. 20), which sets images to original music. Alec Baldwin narrates. Series premiere airs Sunday, Nov. 7, at 8 p.m., National Geographic Channel