Prairie Creek Redwoods State Park 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. Photograph by Michael Nichols

Viburnum Leaf The palette of the Adirondack forest shifts with the seasons. In the delicate tracery of a viburnum leaf, summer’s green gives way to autumn’s red as chlorophyll fades and underlying pigments emerge. Photograph by Michael Melford

 

Puffin, Shiant Islands. Dapper black-and-white razorbills (at right) and bright-beaked puffins (at left and in air, at center) find a haven on the Shiant Islands, just a few miles southeast of Lewis, Scotland. Nearly 8,000 razorbills and more than 200,000 puffins are estimated to use these islands as their breeding grounds each year. Photograph by Jim Richardson

 

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