Edited by Kelly Krechmer, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Mike Baird, some rights reserved (CC BY)
- 2. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal
- 3. (c) sallen, some rights reserved (CC BY-NC), uploaded by sallen
- 4. (c) Tim Giller, some rights reserved (CC BY-NC), uploaded by Tim Giller
- 5. (c) Bert Kaufmann, some rights reserved (CC BY-NC)
- 6. (c) Francesco Veronesi, some rights reserved (CC BY-SA)
- 7. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 8. (c) Rick Leche - Photography, some rights reserved (CC BY-NC-ND)
- 9. (c) Kentish Plumber, some rights reserved (CC BY-NC-ND)
- 10. (c) Doug Greenberg, some rights reserved (CC BY-NC-ND)
- 11. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
- 12. (c) Jamie Chavez, some rights reserved (CC BY-NC)
- 13. (c) Ross Millikan, some rights reserved (CC BY-NC), uploaded by Ross Millikan
- 14. (c) Paul Cools, some rights reserved (CC BY-NC), uploaded by Paul Cools
- 15. (c) Alex J Burchard, some rights reserved (CC BY-NC), uploaded by Alex J Burchard
- 16. (c) Len Blumin, some rights reserved (CC BY-NC-ND)
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- 18. (c) BJ Stacey, some rights reserved (CC BY-NC)
- 19. (c) Magnus Lindberg - Close to nature, some rights reserved (CC BY-NC-ND)
- 20. (c) kha, some rights reserved (CC BY-NC), uploaded by kha
- 21. (c) Len Blumin, some rights reserved (CC BY)
- 22. (c) Robert, some rights reserved (CC BY-NC-ND)
- 23. (c) TexasEagle, some rights reserved (CC BY-NC)
- 24. (c) M. Goff, some rights reserved (CC BY-NC-SA), uploaded by M. Goff
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- 27. (c) karorem, some rights reserved (CC BY-NC), uploaded by karorem
- 28. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 29. (c) Caleb Slemmons, some rights reserved (CC BY-NC)
- 30. (c) Ómar Runólfsson, some rights reserved (CC BY)
- 31. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 32. (c) Ronald Kelley, some rights reserved (CC BY-NC), uploaded by Ronald Kelley
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- 34. (c) dlbowls, some rights reserved (CC BY-NC), uploaded by dlbowls
- 35. (c) Joanne Redwood, some rights reserved (CC BY-NC), uploaded by Joanne Redwood
- 36. (c) Jonathan Eisen, some rights reserved (CC BY), uploaded by Jonathan Eisen
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- 39. (c) Bob, some rights reserved (CC BY-NC-ND)
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- 41. (c) joannerusso, some rights reserved (CC BY-NC), uploaded by joannerusso
- 42. (c) Dan Roach, some rights reserved (CC BY-NC), uploaded by Dan Roach
- 43. no rights reserved, uploaded by Kyle Nessen
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- 46. (c) Jim Johnson, some rights reserved (CC BY-NC-ND), uploaded by Jim Johnson
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- 48. (c) Fred Hochstaedter, some rights reserved (CC BY-NC-SA)
- 49. (c) Rick Leche - Photography, some rights reserved (CC BY-NC)
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- 54. (c) Chuck Roberts, some rights reserved (CC BY-NC-ND)
- 55. (c) Bonnie Kinder, some rights reserved (CC BY-NC), uploaded by Bonnie Kinder
- 56. (c) Chris Rohrer, some rights reserved (CC BY-NC), uploaded by Chris Rohrer
- 57. (c) anonymous, some rights reserved (CC BY-SA)
- 58. (c) Rick Leche, some rights reserved (CC BY-NC)
- 59. (c) Mark Kilner, some rights reserved (CC BY-NC-SA)
- 60. (c) Sergey Yeliseev, some rights reserved (CC BY-NC-ND)
- 61. (c) Rick Leche, some rights reserved (CC BY-NC-ND)
- 62. (c) Robert Keereweer, some rights reserved (CC BY-NC)
- 63. (c) Luciano Giussani, some rights reserved (CC BY-NC-SA)
- 64. (c) BJ Stacey, some rights reserved (CC BY-NC), uploaded by BJ Stacey
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- 66. (c) Bill Bouton, some rights reserved (CC BY-SA)
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- 68. (c) JanetandPhil, some rights reserved (CC BY-NC-ND)
- 69. (c) ian wetton, some rights reserved (CC BY-NC-ND)
- 70. (c) Warren Cronan, some rights reserved (CC BY-NC), uploaded by Warren Cronan
- 71. (c) Игорь Двуреков, some rights reserved (CC BY-NC), uploaded by Игорь Двуреков
- 72. (c) kens18, some rights reserved (CC BY-NC), uploaded by kens18
- 73. (c) Bill Carrell, some rights reserved (CC BY-NC-ND), uploaded by Bill Carrell
- 74. (c) Kyle Tansley, some rights reserved (CC BY-NC), uploaded by Kyle Tansley
- 75. (c) Alan Vernon, some rights reserved (CC BY-NC-SA)
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- 77. (c) Joe McKenna, some rights reserved (CC BY-NC)
- 78. (c) Ralf Nowak, some rights reserved (CC BY-NC-SA)
- 79. (c) Kai Schreiber, some rights reserved (CC BY-NC-SA)
- 80. (c) msr, some rights reserved (CC BY-NC), uploaded by msr
- 81. (c) Zach Hawn, some rights reserved (CC BY-NC-SA)