September 23, 2009
Prairie Creek Redwoods State Park
Photograph by Michael Nichols
This Month in Photo of the Day: National Geographic Magazine
Fourteen stories up a 30-story tree, Humboldt State University scientist Steve Sillett (at center) and his team measure a fire cave in a massive redwood in Prairie Creek Redwoods State Park. Wildfires have twice burned this tree but failed to kill it.
See more photographs from the October 2009 feature story "Redwoods."