Experience some of nature's most incredible spectacles as millions of creatures undertake extraordinary journeys of survival. Enter a golden blizzard as tens of millions of monarch butterflies fill the sky in the hidden highlands of Mexico. Fly alongside migratory birds navigating by the sun, stars, and instinct. Encounter the affectionate curiosity of majestic Grey whales in the beautiful lagoons of Mexico's Baja California. Witness the mysterious migration of more than 100 million red crabs cm tiny Christmas Island in the Indian Ocean. Join the sweeping spectacle of thousands of migrating zebras in the vast, wildlife-filled plains of East Africa. Travel back in time among exotic tribes of Africa to explore the roots of human migration.