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Photo Credits
- 1. (c) Sean McCann, some rights reserved (CC BY-NC-SA)
- 2. (c) Bill Bumgarner, some rights reserved (CC BY-NC-ND)
- 3. (c) dloarie, some rights reserved (CC BY), uploaded by dloarie
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- 5. (c) Eduardo Axel Recillas Bautista, some rights reserved (CC BY-NC), uploaded by Eduardo Axel Recillas Bautista
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- 9. (c) Damon Tighe, some rights reserved (CC BY-NC), uploaded by Damon Tighe
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- 11. (c) Bob Peterson, some rights reserved (CC BY-SA)
- 12. (c) Cheryl Harleston López Espino, some rights reserved (CC BY-NC-ND), uploaded by Cheryl Harleston López Espino
- 13. (c) John Flannery, some rights reserved (CC BY-SA)
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- 16. (c) David Bygott, some rights reserved (CC BY-NC-SA)
- 17. (c) Jason M Crockwell, some rights reserved (CC BY-NC-ND), uploaded by Jason M Crockwell
- 18. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 19. (c) Corey Lange, some rights reserved (CC BY-NC), uploaded by Corey Lange
- 20. (c) David Hofmann, some rights reserved (CC BY-NC-ND)
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- 23. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
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- 30. (c) Anne Reeves, some rights reserved (CC BY-ND)
- 31. (c) Leslie Flint, some rights reserved (CC BY-NC), uploaded by Leslie Flint
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- 35. (c) Pavel Kirillov, some rights reserved (CC BY-NC-SA)
- 36. (c) Juan Cruzado Cortés, some rights reserved (CC BY-SA), uploaded by Juan Cruzado Cortés
- 37. (c) Chris Rohrer, some rights reserved (CC BY-NC), uploaded by Chris Rohrer
- 38. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 39. (c) Bill Swindaman, some rights reserved (CC BY-NC)
- 40. (c) Jacob Bell, some rights reserved (CC BY-NC), uploaded by Jacob Bell
- 41. (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block
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- 51. (c) Eric Jacob, some rights reserved (CC BY-NC), uploaded by Eric Jacob
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- 53. (c) CARLOS VELAZCO, some rights reserved (CC BY-NC), uploaded by CARLOS VELAZCO
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- 55. (c) Katja Schulz, some rights reserved (CC BY)
- 56. (c) Alfonso Gutiérrez Aldana, some rights reserved (CC BY-NC), uploaded by Alfonso Gutiérrez Aldana
- 57. (c) Liam O'Brien, some rights reserved (CC BY-NC), uploaded by Liam O'Brien
- 58. (c) Erin McKiernan, some rights reserved (CC BY-NC-ND), uploaded by Erin McKiernan
- 59. (c) cotinis, some rights reserved (CC BY-NC-SA)
- 60. (c) Bill Bouton, some rights reserved (CC BY-SA)
- 61. (c) Andres Hernandez S., some rights reserved (CC BY-NC-SA)
- 62. (c) Angie Shyrigh, some rights reserved (CC BY-NC)
- 63. (c) Roberta Laidman, some rights reserved (CC BY-NC-SA)
- 64. (c) Pedro Alanis, some rights reserved (CC BY-NC), uploaded by Pedro Alanis
- 65. (c) Chuck Sexton, some rights reserved (CC BY-NC), uploaded by Chuck Sexton
- 66. (c) mlhradio, some rights reserved (CC BY-NC)
- 67. (c) Carlos G Velazco-Macias, some rights reserved (CC BY-NC), uploaded by Carlos G Velazco-Macias
- 68. (c) Manuel Grosselet, some rights reserved (CC BY-NC), uploaded by Manuel Grosselet
- 69. (c) Detroit Zoo Butterflies, some rights reserved (CC BY-NC-SA)
