Yva Momatiuk & John Eastcott / Sapling amid coniferous trees burned by forest fire, Yellowstone National Park, Wyoming

Jim Brandenburg / Ripples in Judd Lake, Minnesota

Michael Quinton / Canada Goose (Branta canadensis) hatchlings in nest with unhatched eggs, spring, Idaho

Tim Fitzharris / California Poppy (Eschscholzia californica), Desert Bluebell (Phacelia campanularia) and other wildflowers in spring bloom, Diamond Valley Lake, California

Jeff Foott / Dirt road, Twenty Mule Team Canyon, Death Valley National Park, California

Scott Leslie / Boardwalk through trees in swamp, Congaree National Park, South Carolina

Scott Leslie / Road, Everglades National Park, Florida

Pete Oxford / Spanish Moss (Tillandsia complanata) growing on Southern Live Oak (Quercus virginiana) with dirt road and cyclist, Little St. Simon's Island, Georgia

Pete Oxford / Spanish Moss (Tillandsia complanata) growing on Southern Live Oak (Quercus virginiana) with dirt road, Little St. Simon's Island, Georgia

Richard Herrmann / Laurel Sumac (Rhus laurina) in 2004, recovering after 2003 fire, Poway, California

Yva Momatiuk & John Eastcott / Sapling amid coniferous trees burned by forest fire, Yellowstone National Park, Wyoming

Jim Brandenburg / Common Loon (Gavia immer) egg in nest, Minnesota

Mark Moffett / Giant Sequoia (Sequoiadendron giganteum) cones overgrown with lichen, Sequoia National Park, California

Mark Moffett / Regeneration forest, near the peak of Mt Saint Helens, Washington

Michael Quinton / Yellowstone fire, new growth of wild flowers after forest fire, Yellowstone National Park, Wyoming

Tim Fitzharris / California Poppy (Eschscholzia californica), Desert Bluebell (Phacelia campanularia) and other wildflowers in spring bloom, Diamond Valley Lake, California

Pete Oxford / Longleaf Pine (Pinus palustris) tree with cone at base, Georgia

Mark Moffett / Regeneration forest near Mt Saint Helens, Washington