Edited by Mark Tate, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Mike Baird, some rights reserved (CC BY)
- 2. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 3. (c) Ferran Pestaña, some rights reserved (CC BY-NC)
- 4. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal
- 5. (c) Per Verdonk, some rights reserved (CC BY-NC)
- 6. (c) Scott Buckel, some rights reserved (CC BY-NC), uploaded by Scott Buckel
- 7. (c) Casey Weissburg, some rights reserved (CC BY-NC), uploaded by Casey Weissburg
- 8. (c) Carlos Sanchez, some rights reserved (CC BY-NC), uploaded by Carlos Sanchez
- 9. (c) iturriagal, some rights reserved (CC BY-NC-ND), uploaded by iturriagal
- 10. (c) Rick Leche - Photography, some rights reserved (CC BY-NC-ND)
- 11. (c) hedera.baltica, some rights reserved (CC BY-SA)
- 12. (c) Kentish Plumber, some rights reserved (CC BY-NC-ND)
- 13. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
- 14. (c) James St. John, some rights reserved (CC BY)
- 15. (c) Dan Pancamo, some rights reserved (CC BY-SA)
- 16. (c) Paul Reeves, some rights reserved (CC BY-NC-SA), uploaded by Paul Reeves
- 17. (c) cyric, some rights reserved (CC BY-NC-SA), uploaded by cyric
- 18. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 19. (c) Paul Cools, some rights reserved (CC BY-NC), uploaded by Paul Cools
- 20. (c) Len Blumin, some rights reserved (CC BY-NC-ND)
- 21. (c) U.S. Fish and Wildlife Service Northeast Region, some rights reserved (CC BY)
- 22. (c) Mark Kilner, some rights reserved (CC BY-NC-SA)
- 23. (c) Mike Hannisian, some rights reserved (CC BY-NC), uploaded by Mike Hannisian
- 24. (c) Magnus Lindberg - Close to nature, some rights reserved (CC BY-NC-ND)
- 25. (c) Len Blumin, some rights reserved (CC BY)
- 26. (c) Robert, some rights reserved (CC BY-NC-ND)
- 27. (c) Gary Ashley, some rights reserved (CC BY-NC)
- 28. (c) Lip Kee, some rights reserved (CC BY-SA)
- 29. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 30. (c) Jack Wolf, some rights reserved (CC BY-NC-ND)
- 31. (c) Ómar Runólfsson, some rights reserved (CC BY)
- 32. (c) Jonathan Eisen, some rights reserved (CC BY), uploaded by Jonathan Eisen
- 33. (c) Maggie.Smith, some rights reserved (CC BY-NC)
- 34. (c) Bobby McCabe, some rights reserved (CC BY), uploaded by Bobby McCabe
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- 36. (c) Bob, some rights reserved (CC BY-NC-ND)
- 37. (c) C.V. Vick, some rights reserved (CC BY-NC-ND)
- 38. (c) andriy, some rights reserved (CC BY-NC), uploaded by andriy
- 39. (c) Geoff Coe, some rights reserved (CC BY-NC-ND)
- 40. (c) Nick Chill, some rights reserved (CC BY-NC-SA)
- 41. (c) Dan Roach, some rights reserved (CC BY-NC), uploaded by Dan Roach
- 42. (c) Bill Carrell, some rights reserved (CC BY-NC-ND), uploaded by Bill Carrell
- 43. (c) Isidro Vila Verde, some rights reserved (CC BY-NC-ND)
- 44. (c) Ty Smith, some rights reserved (CC BY-NC), uploaded by Ty Smith
- 45. (c) Jim Johnson, some rights reserved (CC BY-NC-ND), uploaded by Jim Johnson
- 46. (c) Richard Wottrich, some rights reserved (CC BY-NC), uploaded by Richard Wottrich
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- 48. (c) Alejandro Bayer Tamayo, some rights reserved (CC BY-SA)
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- 50. (c) fiddleman, some rights reserved (CC BY-NC), uploaded by fiddleman
- 51. (c) John Beetham, some rights reserved (CC BY-NC-SA)
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- 53. (c) Sergey Yeliseev, some rights reserved (CC BY-NC-ND)
- 54. (c) Rick Leche, some rights reserved (CC BY-NC-ND)
- 55. (c) Robert Keereweer, some rights reserved (CC BY-NC)
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- 57. (c) Bill Bouton, some rights reserved (CC BY-SA)
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- 59. (c) JanetandPhil, some rights reserved (CC BY-NC-ND)
- 60. (c) ian wetton, some rights reserved (CC BY-NC-ND)
- 61. (c) Warren Cronan, some rights reserved (CC BY-NC), uploaded by Warren Cronan
- 62. (c) Kyle Tansley, some rights reserved (CC BY-NC), uploaded by Kyle Tansley
- 63. (c) Alan Vernon, some rights reserved (CC BY-NC-SA)
- 64. (c) Joseph F. Pescatore, some rights reserved (CC BY-ND)
- 65. (c) Joe McKenna, some rights reserved (CC BY-NC)
- 66. (c) Ralf Nowak, some rights reserved (CC BY-NC-SA)
- 67. (c) Jen Goellnitz, some rights reserved (CC BY-NC)
- 68. (c) Kelly Colgan Azar, some rights reserved (CC BY-ND)
- 69. (c) Laura Gooch, some rights reserved (CC BY-NC-SA)
- 70. (c) Jamie Chavez, some rights reserved (CC BY-NC)
- 71. (c) Yathin, some rights reserved (CC BY-NC-ND)
- 72. Shenandoah National Park, no known copyright restrictions (public domain)
- 73. (c) Steve Guttman NYC, some rights reserved (CC BY-NC-ND)
- 74. (c) Elizabeth Olan Palma, some rights reserved (CC BY-NC), uploaded by Elizabeth Olan Palma
- 75. (c) Maris Pukitis, some rights reserved (CC BY-NC-SA)
- 76. (c) Tony Hisgett, some rights reserved (CC BY)
- 77. (c) Charlotte Bill, some rights reserved (CC BY-NC), uploaded by Charlotte Bill
- 78. (c) Kent C. Jensen, some rights reserved (CC BY-NC), uploaded by Kent C. Jensen
- 79. (c) Tim Harding, some rights reserved (CC BY-NC-ND)
- 80. (c) Josh Vandermeulen, some rights reserved (CC BY-NC-ND), uploaded by Josh Vandermeulen
- 81. (c) philippe, some rights reserved (CC BY-NC-ND)
- 82. (c) Joseph D Kurtz, some rights reserved (CC BY-NC), uploaded by Joseph D Kurtz