Tim Fitzharris / Sagewort (Artemisia sp) on sand dune, Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado

Sebastian Kennerknecht / Santa Cruz Long-toed Salamander (Ambystoma macrodactylum croceum) researchers looking at and measuring individual migrating to upland habitat, Aptos, Monterey Bay, California

Tim Fitzharris / Quaking Aspen (Populus tremuloides) trees in autumn, Santa Fe National Forest near Santa Fe, New Mexico

Tim Fitzharris / Quaking Aspen (Populus tremuloides) trees in autumn, Santa Fe National Forest near Santa Fe, New Mexico

Tim Fitzharris / Cooper's Hawk (Accipiter cooperii) flying over Quaking Aspen (Populus tremuloides) forest, Santa Fe National Forest, Sangre de Cristo Mountains, New Mexico

Sebastian Kennerknecht / Santa Cruz Long-toed Salamander (Ambystoma macrodactylum croceum) in upland oak habitat, Aptos, Monterey Bay, California

Sebastian Kennerknecht / Santa Cruz Long-toed Salamander (Ambystoma macrodactylum croceum) heading to breeding pond, Aptos, Monterey Bay, California

Sebastian Kennerknecht / Santa Cruz Long-toed Salamander (Ambystoma macrodactylum croceum) heading to breeding pond, Aptos, Monterey Bay, California

Tim Fitzharris / Coyote tracks flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado

Tim Fitzharris / Sangre de Cristo Mountains visible behind 750-foot tall sand dunes in winter, Great Sand Dunes National Park, Colorado

Tim Fitzharris / Full moon rising over Sangre de Cristo Mountain Range, Alamosa National Wildlife Refuge, Colorado

Tim Fitzharris / Sand dunes with Sangre de Cristo Mountains in the background, Great Sand Dunes National Park and Preserve, Colorado

Tim Fitzharris / Rippled sand dunes with Sangre de Cristo Mountains in the background, Great Sand Dunes National Park and Preserve, Colorado

Tim Fitzharris / Rio Grande and Sangre de Cristo Mountains, Colorado

Tim Fitzharris / Rio Grande and the Sangre de Cristo Mountains, Colorado

Tim Fitzharris / Rio Grande and the Sangre de Cristo Mountains, Colorado

Tim Fitzharris / 750 foot tall sand dunes rise against the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado

Tim Fitzharris / Sangre de Cristo Mountains at Great Sand Dunes National Monument, Colorado

Tim Fitzharris / Coyote tracks flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado

Tim Fitzharris / Flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado

Tim Fitzharris / Sangre de Cristo Mountains at Great Sand Dunes National Monument, Colorado

Tim Fitzharris / Quaking Aspen (Populus tremuloides) forest in autumn, Santa Fe National Forest, Sangre de Cristo Mountains, New Mexico