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  1. Miller Park Zoo, Bloomington, Illinois.
  2. Sioux Falls, South Dakota. A porcupine, Erethizon dorsatum, at the Great Plains Zoo
  3. Monarch butterflies, Danaus plexippus, in the Sierra Chincua mountains
  4. Canton, Kansas
  5. Mason, Texas
  6. Hutchinson, Kansas
  7. Atacama Desert, Chile
  8. A close view of a black-tailed prairie dog, U.L. Bend National Wildlife Refuge, Montana
  9. A military macaw at the Denver Zoo, Denver, Colorado
  10. A tree frog on a leaf, Madidi National Park, Bolivia
  11. A military macaw at the Denver Zoo, Denver, Colorado
  12. Snow geese flying by the sun at twilight, Squaw Creek National Wildlife Refuge, Missouri
  13. A red eyed tree frog (Agalychnis callidryas) at the Sunset Zoo
  14. Boston night aerial with time exposure car lights on Central Artery
  15. A tokay gecko, the Sunset Zoo, Manhattan, Kansas, United States of America
  16. Black-faced spider monkey, Madidi National Park, Bolivia
  17. Close up of an African eagle ow, Animal Kingdom, Orlando, Florida
  18. A red eyed tree frog (Agalychnis callidryas) at the Sunset Zoo
  19. Close up of an ostrich's head at Fossil Rim Wildlife Center, Glen Rose, Texas
  20. A white oak leaf
  21. Sandhill cranes silhouetted against a twilight sky, Nebraska
  22. An artichoke on a studio background
  23. Lightning fills the night sky near Walton
  24. A western screech owl at the Denver Zoo, Denver, Colorado
  25. Eight-week-old gray wolf, Rapid City, South Dakota
  26. A hiker silhouetted against snow-covered Mount McKinley, Denali National Park, Alaska
  27. An overpass for wildlife spans the Trans Canada Highway in Banff, Alberta, Canada
  28. A waxy frog, Phyllomedusa sauvagii
  29. South Dakotas famed Mount Rushmore National Monument
  30. Misty view of a gray wolf sitting near a tree, Yellowstone National Park, Wyoming
  31. A sea otter and pup off of Adak Island, Aleutian Islands, Alaska
  32. Gray wolf at the International Wolf Center, Ely, Minnesota
  33. A captive gray wolf licks his nose, Rapid City, South Dakota
  34. An American chestnut leaf
  35. Two of eight pups with parent of captive Mexican gray wolves, Wichita, Kansas
  36. A silver maple leaf
  37. Cilantro on a studio background
  38. A group of caimans wait for fish, Pantanal, Brazil
  39. A female grizzly and her cub, Larson Bay, Alaska
  40. Three of eight pups of captive Mexican gray wolves, Wichita, Kansas
  41. A wasp casts a shadow on a white piece of paper
  42. An attack submarine cruises into port at Groton, Connecticut
  43. Close up of a prairie dog, Montana
  44. Sunset falls on the Salar de Atacama salt flat, Atacama Desert, Chile
  45. A green tree python at the Riverside Zoo
  46. Gray clouds over the ancient ruins of Stonehenge
  47. Indochinese tiger at Omahas Henry Doorly Zoo
  48. A close-up of berries during winter, Lincoln, Nebraska