Giant Sequioa: Photographing the World's Biggest Trees - Steve Sillett

Some of the United States' most unique flora are also its biggest. The giant sequoia, featured on the cover of December 2012's National Geographic magazine, are so big that their branches sustain an ecosystem of their own. Steve Sillett tells Boyd that The President, a 3,200 year old sequoia, isn't the tallest tree in the world, or the widest, but it's the second largest in terms of volume.