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Photo Credits
- 1. (c) SMBishop, some rights reserved (CC BY-SA)
- 2. no rights reserved
- 3. (c) Marlo Perdicas, some rights reserved (CC BY), uploaded by Marlo Perdicas
- 4. (c) Jason Whittle, some rights reserved (CC BY-NC-ND), uploaded by Jason Whittle
- 5. (c) Juan Cruzado Cortés, some rights reserved (CC BY-SA), uploaded by Juan Cruzado Cortés
- 6. (c) Eric Soehren, some rights reserved (CC BY-NC), uploaded by Eric Soehren
- 7. (c) Anita Gould, some rights reserved (CC BY-NC), uploaded by Anita Gould
- 8. (c) Juan Cruzado, some rights reserved (CC BY-SA), uploaded by Juan Cruzado
- 9. (c) Cullen Hanks, some rights reserved (CC BY-NC), uploaded by Cullen Hanks
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- 13. (c) Andrew Reding, some rights reserved (CC BY-NC-ND)
- 14. (c) Dan Dzurisin, some rights reserved (CC BY-NC-ND)
- 15. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 16. (c) Josh More, some rights reserved (CC BY-NC-ND)
- 17. (c) Bering Land Bridge National Preserve, some rights reserved (CC BY)
- 18. (c) davidcooksy, some rights reserved (CC BY-NC)
- 19. (c) Yersinia pestis, some rights reserved (CC BY-NC-SA)
- 20. (c) Dan Dzurisin, some rights reserved (CC BY)
- 21. (c) Carlos Ramirez Aldrete, some rights reserved (CC BY-NC), uploaded by Carlos Ramirez Aldrete
- 22. (c) Phil Warren, some rights reserved (CC BY-NC), uploaded by Phil Warren
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- 24. (c) Don McCullough, some rights reserved (CC BY-NC)
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- 26. (c) Todd Fitzgerald, some rights reserved (CC BY-NC), uploaded by Todd Fitzgerald
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- 28. (c) Cullin, some rights reserved (CC BY-NC), uploaded by Cullin
- 29. (c) Tanner Senti, some rights reserved (CC BY-NC), uploaded by Tanner Senti
- 30. (c) Ron Payne, some rights reserved (CC BY-NC), uploaded by Ron Payne
- 31. (c) J. Burke Korol, some rights reserved (CC BY-NC), uploaded by J. Burke Korol
- 32. (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick
- 33. (c) Bert Cash, some rights reserved (CC BY)
- 34. (c) Rob Curtis, some rights reserved (CC BY-NC-SA), uploaded by Rob Curtis
- 35. (c) Nick Tepper, some rights reserved (CC BY-NC), uploaded by Nick Tepper
- 36. (c) Mossos. Generalitat de Catalunya, some rights reserved (CC BY-ND)
- 37. (c) crgillette, some rights reserved (CC BY-NC), uploaded by crgillette
- 38. (c) Gilles Gonthier, some rights reserved (CC BY)
- 39. (c) U.S. Fish and Wildlife Service Headquarters, some rights reserved (CC BY)
- 40. (c) pfaucher, some rights reserved (CC BY-NC), uploaded by pfaucher
- 41. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal
- 42. (c) Jakob Fahr, some rights reserved (CC BY-NC), uploaded by Jakob Fahr
- 43. (c) Dave Thomas, some rights reserved (CC BY-NC)
- 44. (c) Grand Canyon National Park, some rights reserved (CC BY)
- 45. (c) Bureau of Land Management Oregon and Washington, some rights reserved (CC BY)
- 46. (c) Howard Friedman, some rights reserved (CC BY-NC), uploaded by Howard Friedman
