We are celebrating the DVD release of one of the best nature films, Earth, by giving away three copies of the DVD.  Available on September 1, on DVD and Blu-Ray, DisneyNature's Earth follows three animal families (elephants, polar bears, and whales) throughout one year.

Check out this bonus material from the DVD, as the filmmakers get remarkable arial footage of the polar bears:

Three of our lucky Twitter followers of MNN will win a copy of the DVD, simply by retweeting one Mother Nature Network story from Tuesday August 18 to Friday September 4, 2009.  Just follow these steps: 

1. Be a Twitter member

2. Follow Mother Nature Network 

3. Retweet at least one MNN story from now 'til September 4, 2009 @mothernaturenet

We will notify the winners of the Earth DVD via a Twitter DM.

For more information, read the rules here.  And for more information on Earth read our article here.