NOVATuotantokausi 13 Lisää kuvaJakson numero17Mystery of the Animal PathfindersOverviewBirds do it; bees do it, butterflies, bats and eels do it—all leave one habitat to migrate to another, often thousands of miles away. NOVA penetrates the mystery of where animals migrate, why and how they get there.Air dateNovember 25, 1986Runtime (min)60