Yva Momatiuk & John Eastcott / Toadstool Caprocks created by erosion, near Paria River, Grand Staircase-Escalante National Monument, Utah

Michael Quinton / Mountain Goat (Oreamnos americanus) portrait, Glacier National Park, Montana

Tim Fitzharris / Balancing rock formation, Guadalupe Mountains National Park, Texas

Tim Fitzharris / Balanced rock, Guadalupe Mountains, Texas

Shin Yoshino / Black-tailed Prairie Dog (Cynomys ludovicianus) sounding all clear call at burrow entrance, Colorado

Michael Quinton / Great Gray Owl (Strix nebulosa) young bird balancing on tree branch, Idaho

Michael Quinton / Spotted Sandpiper (Tringa macularia) couple courting while standing on lily pads in the summer, Wyoming

Michael Quinton / Trumpeter Swan (Cygnus buccinator) pair with reflections in lake, Yellowstone National Park, Wyoming

Fred Bavendam / Harbor Seal (Phoca vitulina) balancing on rock, Monterey, California

Tim Fitzharris / Balanced rock in the Grapevine Mountains, Big Bend National Park, Texas