"The Great flying" "The story of migrating birds is the story of a promise" "The promise to return" "Their journey over thousands of miles in froth of dangers serves a single purpose" "Survival..." "Their migration is a fight for life" "In the North ern hemisphere spring time they take wing toward arctic land where they were born" "Some fly relentlessly day and night" "Others take tripping stages laboring to weeks their distant destinations" "To navigate their wave one latitude to another migrating birds use astronomical markers" "Sun and Stars" "They are also sensitive to the earth's magnetic field as a compass needle" "Migrating birds from every continent finally converge on Arctic destination and disperse" "Soon the irchicks will hatch" "They have little time to prepare their first migration" "Summer in Arctic is short" "Soon frozen north will be plunged into polaris" "It's time for the Antarctic migration to begin" "The young have barely learned to fly and fan for themselves before they too are off on the way to tropics" "Without ever having tested their roots" "They were reaching the exact location thousand smiles away" "For millions of birds left from Northern Europe them igration comes to an end in Africa" "Many failed to complete the journey" "In the tropics, birds migrating from the Southern hemisphere have taken the place of those from the North" "Gigantic flocks move constantly in search of the food" "No land matches in peace swell of the South sea" "Seabirds nest on the wind whipped islands" "Some only come to land after circling the Antarctic for years" "In the Northern hemisphere the migrating birds are assuring the new spring" "In the sky, the same flight routes are busy again" "The promise to return has been fulfilled"