Edited by Kyle Pearce, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Annette Le Faive, some rights reserved (CC BY-NC), uploaded by Annette Le Faive
- 2. (c) Chris Close, some rights reserved (CC BY-NC), uploaded by Chris Close
- 3. (c) erik_p, some rights reserved (CC BY-NC), uploaded by erik_p
- 4. (c) Kuxansum, some rights reserved (CC BY-NC)
- 5. (c) Jason Sturner, some rights reserved (CC BY)
- 6. (c) randomtruth, some rights reserved (CC BY-NC-SA)
- 7. (c) Eric in SF, some rights reserved (CC BY-NC-ND)
- 8. (c) Jason Headley, some rights reserved (CC BY-NC), uploaded by Jason Headley
- 9. (c) Quinten Wiegersma, some rights reserved (CC BY), uploaded by Quinten Wiegersma
- 10. (c) Denali National Park and Preserve, some rights reserved (CC BY)
- 11. (c) erylander, some rights reserved (CC BY-NC), uploaded by erylander
- 12. (c) Andrea Peterlongo, some rights reserved (CC BY-NC), uploaded by Andrea Peterlongo
- 13. (c) 1977 Gary A. Monroe, some rights reserved (CC BY-NC)
- 14. (c) Heidi Eaton, some rights reserved (CC BY-NC), uploaded by Heidi Eaton
- 15. (c) mhays, some rights reserved (CC BY-NC), uploaded by mhays
- 16. (c) Andy Fyon, some rights reserved (CC BY-NC), uploaded by Andy Fyon
- 17. (c) Richard Droker, some rights reserved (CC BY-NC-ND)
- 18. (c) Léo-Guy de Repentigny, some rights reserved (CC BY-NC), uploaded by Léo-Guy de Repentigny
- 19. (c) Joshua Wysor, some rights reserved (CC BY-NC)
- 20. (c) Paul Tavares, some rights reserved (CC BY-NC), uploaded by Paul Tavares
- 21. (c) Mark Kluge, some rights reserved (CC BY-NC), uploaded by Mark Kluge
- 22. (c) Pohled 111, some rights reserved (CC BY-SA)
- 23. (c) AJC1, some rights reserved (CC BY-SA)
- 24. (c) Janel Johnson, some rights reserved (CC BY-NC), uploaded by Janel Johnson
- 25. (c) David Hofmann, some rights reserved (CC BY-NC-ND)
- 26. (c) Tom Hilton, some rights reserved (CC BY), uploaded by Tom Hilton
- 27. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 28. (c) stellaginella, some rights reserved (CC BY-NC), uploaded by stellaginella
- 29. (c) Mashuri Waite, some rights reserved (CC BY-NC), uploaded by Mashuri Waite
- 30. (c) Michelle Goerdel, some rights reserved (CC BY-NC), uploaded by Michelle Goerdel
- 31. (c) Matt Lavin, some rights reserved (CC BY-SA)
- 32. (c) kbeeley, some rights reserved (CC BY-NC), uploaded by kbeeley
- 33. (c) Jackie Grant, some rights reserved (CC BY-NC-SA), uploaded by Jackie Grant
- 34. (c) Lori Skulski, some rights reserved (CC BY-NC), uploaded by Lori Skulski
- 35. (c) John B, some rights reserved (CC BY-NC)
- 36. (c) dave birney, some rights reserved (CC BY-NC)
- 37. (c) peupleloup, some rights reserved (CC BY-SA)
- 38. (c) wetlandfan, some rights reserved (CC BY-NC-ND), uploaded by wetlandfan
- 39. (c) rkluzco, some rights reserved (CC BY-NC)
- 40. (c) CatherineK, some rights reserved (CC BY-SA), uploaded by CatherineK
- 41. (c) Mikael Creative, some rights reserved (CC BY-NC-ND)
- 42. (c) Peter Stevens, some rights reserved (CC BY)
- 43. (c) rangerkelly, some rights reserved (CC BY-NC), uploaded by rangerkelly
- 44. (c) mariendistel, some rights reserved (CC BY-NC), uploaded by mariendistel
- 45. (c) Blake Weis, some rights reserved (CC BY-NC), uploaded by Blake Weis
- 46. (c) Bryant Olsen, some rights reserved (CC BY-NC), uploaded by Bryant Olsen
- 47. (c) Valerie Orich, some rights reserved (CC BY-ND), uploaded by Valerie Orich
- 48. (c) J.R.M., some rights reserved (CC BY-NC-SA)
- 49. (c) Елена Шубницина, some rights reserved (CC BY-NC), uploaded by Елена Шубницина
- 50. (c) Kristian Peters, some rights reserved (CC BY-NC-SA)
- 51. (c) Katja Schulz, some rights reserved (CC BY)
- 52. (c) Anita, some rights reserved (CC BY-NC)
- 53. no rights reserved, uploaded by Patrick Alexander
- 54. (c) Logan J.L. Bradley, some rights reserved (CC BY), uploaded by Logan J.L. Bradley
- 55. (c) Samuel Brinker, some rights reserved (CC BY-NC), uploaded by Samuel Brinker
- 56. (c) aekurtz, some rights reserved (CC BY-NC), uploaded by aekurtz
- 57. (c) Laurel F, some rights reserved (CC BY-SA)
- 58. (c) Simon, some rights reserved (CC BY-NC), uploaded by Simon
- 59. (c) tobypcr, some rights reserved (CC BY-NC), uploaded by tobypcr
- 60. (c) Joanne Siderius, some rights reserved (CC BY-NC), uploaded by Joanne Siderius
- 61. (c) Gravitywave, some rights reserved (CC BY-NC-SA)
- 62. (c) David Greenberger, some rights reserved (CC BY-NC-ND), uploaded by David Greenberger
- 63. (c) Amadej Trnkoczy, some rights reserved (CC BY-NC-SA)
- 64. (c) Zolotukhina Irina, some rights reserved (CC BY-NC), uploaded by Zolotukhina Irina
- 65. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 66. (c) HermannFalkner/sokol, some rights reserved (CC BY-NC)
- 67. (c) Susan Elliott, some rights reserved (CC BY-NC), uploaded by Susan Elliott
- 68. (c) Dmitry Kulakov, some rights reserved (CC BY), uploaded by Dmitry Kulakov
- 69. (c) Brent Miller, some rights reserved (CC BY-NC-ND)
- 70. (c) Andrey Zharkikh, some rights reserved (CC BY-NC), uploaded by Andrey Zharkikh
- 71. (c) M. Goff, some rights reserved (CC BY-NC-SA), uploaded by M. Goff
- 72. (c) Suzanne Dingwell, some rights reserved (CC BY-NC), uploaded by Suzanne Dingwell
- 73. (c) pnorton, some rights reserved (CC BY-NC), uploaded by pnorton
- 74. (c) Benoit NABHOLZ, some rights reserved (CC BY-SA), uploaded by Benoit NABHOLZ
- 75. (c) Rodrigo Sala, some rights reserved (CC BY-ND)
- 76. (c) Sebastian Ćato, some rights reserved (CC BY-NC), uploaded by Sebastian Ćato
- 77. (c) Belinda Lo, some rights reserved (CC BY-NC-SA), uploaded by Belinda Lo
- 78. (c) Mike Ryan, some rights reserved (CC BY-NC), uploaded by Mike Ryan
- 79. (c) Joanne Golden, some rights reserved (CC BY-NC), uploaded by Joanne Golden