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Photo Credits
- 1. (c) Hermann Falkner, some rights reserved (CC BY-NC)
- 2. (c) botanygirl, some rights reserved (CC BY), uploaded by botanygirl
- 3. (c) Antonio Ilardo, some rights reserved (CC BY-NC-SA)
- 4. (c) Matt Lavin, some rights reserved (CC BY-SA)
- 5. (c) Sara Rall, some rights reserved (CC BY-NC), uploaded by Sara Rall
- 6. (c) Susan J. Hewitt, some rights reserved (CC BY-NC), uploaded by Susan J. Hewitt
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- 11. (c) John Boback, some rights reserved (CC BY-NC), uploaded by John Boback
- 12. (c) Ken-ichi Ueda, some rights reserved (CC BY)
- 13. (c) icosahedron, some rights reserved (CC BY), uploaded by icosahedron
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- 15. (c) Peter Hanegraaf, some rights reserved (CC BY-NC-ND)
- 16. (c) Rob Curtis, some rights reserved (CC BY-NC-SA), uploaded by Rob Curtis
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- 18. (c) Valter Jacinto | Portugal, some rights reserved (CC BY-NC-SA)
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- 20. (c) Aaron Ellig, some rights reserved (CC BY-ND), uploaded by Aaron Ellig
- 21. (c) Zihao Wang, some rights reserved (CC BY), uploaded by Zihao Wang
- 22. (c) 2006 Luigi Rignanese, some rights reserved (CC BY-NC)
- 23. (c) Forest and Kim Starr, some rights reserved (CC BY)
- 24. (c) Brett Sandford, some rights reserved (CC BY), uploaded by Brett Sandford
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- 27. (c) Hörður Kristinsson, some rights reserved (CC BY-NC)
- 28. (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick
- 29. (c) Forest & Kim Starr, some rights reserved (CC BY)
- 30. (c) c michael hogan, some rights reserved (CC BY-NC-SA), uploaded by c michael hogan
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- 32. (c) Petr Filippov, some rights reserved (CC BY)
- 33. (c) Sequoia Janirella Wrens, some rights reserved (CC BY-NC), uploaded by Sequoia Janirella Wrens
- 34. (c) Dave Spier, some rights reserved (CC BY-NC-SA)
- 35. (c) Shihmei Barger 舒詩玫, some rights reserved (CC BY-NC-ND)
- 36. (c) Ronnie Pitman, some rights reserved (CC BY-NC)
- 37. (c) DavidR.808, some rights reserved (CC BY-NC), uploaded by DavidR.808
- 38. (c) jacki-dee ('retro look' option please), some rights reserved (CC BY-NC-ND)
- 39. (c) Suzanne Cadwell, some rights reserved (CC BY-NC)
- 40. (c) eknuth, some rights reserved (CC BY-NC), uploaded by eknuth
- 41. (c) Phillip Merritt, some rights reserved (CC BY-NC-SA)
- 42. (c) John Brandauer, some rights reserved (CC BY-NC-ND)
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- 45. (c) John Barkla, some rights reserved (CC BY), uploaded by John Barkla
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- 47. (c) Michael Skvarla, some rights reserved (CC BY-NC-SA), uploaded by Michael Skvarla
- 48. (c) harum.koh, some rights reserved (CC BY-SA), uploaded by harum.koh
- 49. (c) Dan Johnson, some rights reserved (CC BY-NC), uploaded by Dan Johnson
- 50. (c) Gábor Wiandt, some rights reserved (CC BY-NC)