"This jaw-dropping, award-winning, landmark series from the BBC’s Natural History Unit presents the epic story of life on Earth. Four years in production, over 2000 days in the field, using 71 cameramen filming across 204 locations in 62 countries, this is the ultimate portrait of our planet. A stunning television experience that combines rare action, unimaginable scale, impossible locations, and intimate moments with our planet's best-loved, wildest, and most elusive creatures. From the highest mountains to the deepest rivers, this blockbuster series takes you on an unforgettable journey through the challenging seasons and the daily struggle for survival in Earth's most extreme habitats. Using a budget of unprecedented proportions, HD photography, and unique, specially developed filming techniques, Planet Earth takes you to places you have never seen before, to experience sights and sounds you may never experience again." -- iTunes Store
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The lives of animals and plants are dominated by the sun and fresh water which trigger seasonal journeys. The latest technology and aerial photography enable the Planet Earth team to track some of the greatest mass migrations.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.