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  1. Gray wolf at the International Wolf Center, Ely, Minnesota
  2. Boston night aerial with time exposure car lights on Central Artery
  3. Wildflowers on coastal prairie, Eagle Lake, Texas
  4. A tawny frogmouth owl, Podargus strigoides, at the Fort Worth Zoo
  5. A mountain goat descends a sheer rock wall to lick exposed salt
  6. Lightning fills the night sky near Walton
  7. Close up of an African eagle ow, Animal Kingdom, Orlando, Florida
  8. A bison, on a ranch near Valentine, Nebraska
  9. South Dakotas famed Mount Rushmore National Monument
  10. The eye and face of a veiled chameleon, Chamaeleo calyptratus
  11. Sandhill cranes silhouetted against a twilight sky, Nebraska
  12. Leadore, Idaho
  13. Misty view of a gray wolf sitting near a tree, Yellowstone National Park, Wyoming
  14. A monarch butterfly at the Lincoln Children's Zoo
  15. Aspen, Colorado
  16. A red barn on a homestead farm in Nebraska
  17. A snowy egret, at the Lincoln Children's Zoo
  18. Indochinese tiger at Omahas Henry Doorly Zoo
  19. A butte often painted by Georgia OKeeffe on her Ghost Ranch
  20. An endangered Malayan tiger, Panthera tigris jacksoni
  21. A mated pair of red and green macaws
  22. A captive grey wolf, Canis lupus, in the snow
  23. A three-month-old baby chimpanzee
  24. Monarch butterflies, Danaus plexippus, in the Sierra Chincua mountains
  25. A silhouette of a herd of bison
  26. Kenai National Wildlife Refuge, Alaska
  27. A gray wolf, Canis lupus, sitting in the midst of a snowy landscape
  28. Three wild burros standing in sagebrush
  29. A captive gray wolf licks his nose, Rapid City, South Dakota
  30. An oil rig silhouetted at sunset
  31. A black bear perches on a rock watching for fish in Clayoquot Sound
  32. Black-faced spider monkey, Madidi National Park, Bolivia
  33. A studio portrait of a yellow lab
  34. A Malaysian golden gliding frog (Polypedates leucomystax)
  35. Eight-week-old gray wolf, Rapid City, South Dakota
  36. A clouded leopard, Neofelis nebulosa
  37. Baby viscacha stretches in front of mother, Atacama Desert, Chile
  38. The sun sets on the Nebraska Sandhills
  39. A red fox stands alert in short grasses
  40. Hutchinson, Kansas
  41. A federally threatened koala with her offspring, one of which is adopted
  42. A silhouette of a herd of bison
  43. A herbivorous viscacha nurses her baby, Atacama Desert, Chile
  44. A tokay gecko, the Sunset Zoo, Manhattan, Kansas, United States of America
  45. Gray wolf at the Rose Creek area of Yellowstone National Park, Wyoming
  46. Capitol dome with moon, Hartford, Connecticut
  47. An oil rig pumps oil from the Montana ground
  48. Monarch butterflies cover every inch of a tree in Sierra Chincua