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  1. Gray wolf at the International Wolf Center, Ely, Minnesota
  2. A mountain goat descends a sheer rock wall to lick exposed salt
  3. A tawny frogmouth owl, Podargus strigoides, at the Fort Worth Zoo
  4. A bison, on a ranch near Valentine, Nebraska
  5. A snowy egret, at the Lincoln Children's Zoo
  6. A non-irrigated field of corn near Bennet, Nebraska
  7. A common raven, Corvus corax principalis, at the Los Angeles Zoo
  8. Wildflowers on coastal prairie, Eagle Lake, Texas
  9. Portrait of a young pig in a snow dusted animal pen
  10. A butte often painted by Georgia OKeeffe on her Ghost Ranch
  11. Composite of 110 different species of ducks and geese
  12. Monarch butterflies, Danaus plexippus, in the Sierra Chincua mountains
  13. Boston night aerial with time exposure car lights on Central Artery
  14. A silhouette of a herd of bison
  15. Brown cockroach, Periplaneta brunnea, at Western Kentucky University
  16. An oil rig silhouetted at sunset
  17. Leadore, Idaho
  18. A clouded leopard, Neofelis nebulosa
  19. An oil rig pumps oil from the Montana ground
  20. A red barn on a homestead farm in Nebraska
  21. A monarch butterfly at the Lincoln Children's Zoo
  22. Three wild burros standing in sagebrush
  23. The sun sets on the Nebraska Sandhills
  24. Close up of an African eagle ow, Animal Kingdom, Orlando, Florida
  25. A red fox stands alert in short grasses
  26. Sandhill cranes silhouetted against a twilight sky, Nebraska
  27. A black bear perches on a rock watching for fish in Clayoquot Sound
  28. A green parakeet, Psittacara holochlorus strenuus, from a private collection
  29. The eye and face of a veiled chameleon, Chamaeleo calyptratus
  30. Monarch butterflies cover every inch of a tree in Sierra Chincua
  31. Misty view of a gray wolf sitting near a tree, Yellowstone National Park, Wyoming
  32. Lightning fills the night sky near Walton
  33. A three-month-old baby chimpanzee
  34. A silhouette of a herd of bison
  35. A country road in Otoe county, Nebraska
  36. A portrait of a bison on a ranch
  37. A captive grey wolf, Canis lupus, in the snow
  38. The paws of a grizzly bear, Ursus arctos horribilis
  39. Wild American bison roam on a game preserve in Kansas
  40. A tokay gecko, the Sunset Zoo, Manhattan, Kansas, United States of America
  41. An endangered Malayan tiger, Panthera tigris jacksoni
  42. A roseate spoonbill, Sabine National Wildlife Refuge, Florida
  43. Koi fish at the Taronga Zoo
  44. A federally threatened koala with her offspring, one of which is adopted
  45. A skyward view of coreopsis flowers in a Texas field
  46. A mated pair of red and green macaws
  47. A lesser short-nosed fruit bat, at the Lubee Bat Conservancy
  48. White tailed hawk, Geranoaetus albicaudatus, at the National Aviary of Colombia