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  1. Close view of a Grant's zebra's (Equus burchelli pamara) rear end
  2. Gray wolves, Canis lupus, in the new-fallen snow at the International Wolf Center
  3. A red fox stands alert in short grasses
  4. A gray wolf, Canis lupus, sitting in the midst of a snowy landscape
  5. An oil rig silhouetted at sunset
  6. An African lion (Panthera leo krugeri) from the Sedgwick County Zoo
  7. A monarch butterfly at the Lincoln Children's Zoo
  8. Portrait of Benjamin Franklin on the one hundred dollar bill
  9. Bison graze on the prairie at Twin Pine Ranch
  10. A red barn on a homestead farm in Nebraska
  11. A close view of a mother holding her newborn baby's hand
  12. A black bear perches on a rock watching for fish in Clayoquot Sound
  13. Portrait of a young pig in a snow dusted animal pen
  14. A skyward view of coreopsis flowers in a Texas field
  15. A grizzly bear at rest on the edge of the Larson Bay dump
  16. Four buff orpington hens in tall grass
  17. Field of coreopsis wildflowers (Coreopsis tinctoria)in coastal prairie
  18. A large adult grizzly bear faces the camera
  19. A jogger in silhouette runs on the surf line of the beach
  20. Three wild burros standing in sagebrush
  21. A leaf of the critically endangered alectryon macrococcus plant
  22. A close view of a northern spotted owl, Strix occidentals occidentals
  23. A captive grey wolf, Canis lupus, in the snow
  24. A B-2 Stealth bomber over the patterned terrain of southwestern Nebraska
  25. Close view of a gorilla face
  26. An oil rig pumps oil from the Montana ground
  27. An eastern screech owl (Otus asio)
  28. A male tiger swallowtail butterfly (Papilio glaucas)
  29. A Malaysian golden gliding frog (Polypedates leucomystax)
  30. Wild American bison roam on a game preserve in Kansas
  31. Rainbow lorikeets, Trichoglossus haematodus
  32. Portrait of a Major Mitchell's Cockatoo, Lophochroa leadbeateri
  33. Monarch butterflies in the Sierra Chincua sanctuary
  34. Monarch butterflies cover every inch of a tree in Sierra Chincua
  35. Mexican flame vine flowers, Pseudogynoxys chenopodioides
  36. Close up of an American columbine, Aquilegia canadensis
  37. Close up of a building in In Denver, Colorado
  38. A western diamondback rattlesnake migrates radially from its den
  39. A thunderstorm moves over the eastern shore of Lake Albert
  40. A red rock crab, Grapsus grapsus, in Galapagos National Park
  41. A Muscadet Oriental Lily, Lilium 'Muscadet'
  42. A Mexican gray wolf, Canis lupus baileyi
  43. A fisherman in Bighorn Creek, part of the Kootenay River system
  44. A federally threatened koala climbs on top of its mother, who has conjunctivitis
  45. A federally endangered blowout penstemons, Penstemon haydenii
  46. A Coquerel's sifaka, Propithecus coquereli, at the Houston Zoo
  47. A close view of the head of a cockatiel, Nymphicus hollandicus
  48. A captive eastern screech owl, Megascops asio, at Ryerson Woods