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Photo Credits
- 1. (c) sankax, some rights reserved (CC BY-NC)
- 2. (c) Matt Claghorn, some rights reserved (CC BY-NC), uploaded by Matt Claghorn
- 3. (c) Tom Murray, some rights reserved (CC BY-NC), uploaded by Tom Murray
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- 6. (c) Diane P. Brooks, some rights reserved (CC BY-NC-SA), uploaded by Diane P. Brooks
- 7. (c) icosahedron, some rights reserved (CC BY), uploaded by icosahedron
- 8. (c) Christian Grenier, some rights reserved (CC BY-NC), uploaded by Christian Grenier
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- 10. (c) Royal Tyler, some rights reserved (CC BY-NC-SA), uploaded by Royal Tyler
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- 12. (c) Arturo Santos, some rights reserved (CC BY), uploaded by Arturo Santos
- 13. (c) juliezickefoose, some rights reserved (CC BY-NC), uploaded by juliezickefoose
- 14. (c) Emily Hjalmarson, some rights reserved (CC BY-NC), uploaded by Emily Hjalmarson
- 15. (c) Katja Schulz, some rights reserved (CC BY)
- 16. (c) Judy Gallagher, some rights reserved (CC BY), uploaded by Judy Gallagher
- 17. (c) Stuart Tingley, some rights reserved (CC BY-NC), uploaded by Stuart Tingley
- 18. (c) skitterbug, some rights reserved (CC BY), uploaded by skitterbug
- 19. (c) David Dodd, some rights reserved (CC BY), uploaded by David Dodd
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- 21. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 22. (c) Brandon, some rights reserved (CC BY-NC), uploaded by Brandon
- 23. (c) Even Dankowicz, some rights reserved (CC BY), uploaded by Even Dankowicz
- 24. (c) John Morgan, some rights reserved (CC BY-NC), uploaded by John Morgan
- 25. (c) Rob Curtis, some rights reserved (CC BY-NC-SA), uploaded by Rob Curtis
- 26. (c) Anita Gould, some rights reserved (CC BY-NC), uploaded by Anita Gould
- 27. (c) Riley Walsh, some rights reserved (CC BY-NC), uploaded by Riley Walsh
- 28. (c) Steven Whitebread, some rights reserved (CC BY), uploaded by Steven Whitebread
- 29. (c) Martha O'Kennon, some rights reserved (CC BY-NC), uploaded by Martha O'Kennon
- 30. (c) Steve Pelikan, some rights reserved (CC BY-NC), uploaded by Steve Pelikan
- 31. (c) Tracey Fandre, some rights reserved (CC BY-NC-ND), uploaded by Tracey Fandre
- 32. (c) molanic, some rights reserved (CC BY-NC), uploaded by molanic
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- 34. (c) Dennis White, some rights reserved (CC BY-NC), uploaded by Dennis White
- 35. (c) Eric Knopf, some rights reserved (CC BY-NC), uploaded by Eric Knopf
- 36. (c) Paul Reeves, some rights reserved (CC BY-NC-SA), uploaded by Paul Reeves
- 37. (c) Owen Strickland, some rights reserved (CC BY-NC), uploaded by Owen Strickland
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- 40. (c) Alex Bowen, some rights reserved (CC BY-NC), uploaded by Alex Bowen
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- 42. (c) Joe Girgente, some rights reserved (CC BY-NC), uploaded by Joe Girgente
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- 46. (c) Jeff Chapman, some rights reserved (CC BY-NC), uploaded by Jeff Chapman
- 47. (c) Martin Grimm, some rights reserved (CC BY-NC), uploaded by Martin Grimm
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- 50. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
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- 53. (c) lorenzodotti, some rights reserved (CC BY-NC), uploaded by lorenzodotti
- 54. (c) Ismael Arellano Ciau, some rights reserved (CC BY-NC), uploaded by Ismael Arellano Ciau
- 55. (c) Carmelo López Abad, some rights reserved (CC BY-NC), uploaded by Carmelo López Abad
- 56. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal
- 57. (c) Caleb Slemmons, some rights reserved (CC BY-NC)
- 58. (c) David Cook Wildlife Photography, some rights reserved (CC BY-NC)
- 59. (c) Francesco Veronesi, some rights reserved (CC BY-NC-SA)
- 60. (c) Isabel, some rights reserved (CC BY-NC), uploaded by Isabel
- 61. (c) Bird Explorers, some rights reserved (CC BY-NC), uploaded by Bird Explorers
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- 63. (c) C.V. Vick, some rights reserved (CC BY-NC)
- 64. (c) Kevin Lin, some rights reserved (CC BY-NC-SA)
- 65. (c) Ján Svetlík, some rights reserved (CC BY-NC-ND)
- 66. (c) Dawson Ross, some rights reserved (CC BY-NC-SA), uploaded by Dawson Ross
- 67. (c) Nick Moore, some rights reserved (CC BY-NC), uploaded by Nick Moore
- 68. (c) David Thomas, some rights reserved (CC BY-NC), uploaded by David Thomas
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- 70. (c) Julien Renoult, some rights reserved (CC BY), uploaded by Julien Renoult
- 71. (c) sallen, some rights reserved (CC BY-NC), uploaded by sallen
- 72. (c) Per Verdonk, some rights reserved (CC BY-NC)
- 73. (c) Jeremy Barker, some rights reserved (CC BY-NC), uploaded by Jeremy Barker
- 74. (c) David Tan, some rights reserved (CC BY-NC), uploaded by David Tan
- 75. (c) Tim Giller, some rights reserved (CC BY-NC), uploaded by Tim Giller
- 76. (c) albissers_grund, some rights reserved (CC BY-NC), uploaded by albissers_grund
- 77. (c) Ron Knight, some rights reserved (CC BY)
- 78. (c) Francesco Veronesi, some rights reserved (CC BY-SA)
- 79. (c) J. N. Stuart, some rights reserved (CC BY-NC-ND)
