A story of three animal families on a journey across our planet - polar bears, elephants, and humpback whales. It captures rare footage of nature's wildest and most elusive animals.

Describes how the bar-tailed godwit prepares for and carries out what is the longest nonstop bird migration--a seven thousand-mile flight from Alaska to New Zealand.

"An exhilarating exploration of the science and wonder of global bird migration. In the past two decades, our understanding of bird migration-the navigational and physiological feats that enable birds to cross immense oceans or fly above the highest mountains, to go weeks without sleep, or remain in unbroken flight for months at a stretch-has exploded. Scientists have made astounding discoveries: certain species, such as thrushes, can avoid dehydration...

Explores the mysteries of bird migration, including theories on how birds find their way and how scientists learn about migration.

A simple presentation of the migratory habits of such animals as geese, eels, frogs and toads, and more.

Look around: the largest migration in human history is under way. For the first time ever, more people are living in cities than in rural areas. Between 2007 and 2050, the world’s cities will have absorbed 3.1 billion people. Urbanization is the mass movement that will change our world during the twenty-first century, and the “arrival city” is where it is taking place.
 
The arrival city exists on the outskirts of

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