Pete Oxford / Horseshoe Crab (Limulus polyphemus) male clinging to the telson of a larger female, Little St. Simon's Island, Georgia

Pete Oxford / Green Tree Frog (Hyla cinerea) clinging to reed, Little St. Simon's Island, Georgia

Tom Vezo / White-breasted Nuthatch (Sitta carolinensis) clinging to tree trunk, Rio Grande Valley, Texas

Michael Durham / Yuma Myotis (Myotis yumanensis) portrait, Rogue River National Forest, Oregon

Tom Vezo / Ladder-backed Woodpecker (Picoides scalaris) on tree, Texas