Edited by Russell Pfau, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Keith Roragen, some rights reserved (CC BY-NC-SA)
- 2. (c) Luciano 95, some rights reserved (CC BY-NC-SA)
- 3. (c) zufi, some rights reserved (CC BY-NC)
- 4. (c) Jonathan (JC) Carpenter, some rights reserved (CC BY-NC), uploaded by Jonathan (JC) Carpenter
- 5. (c) Katja Schulz, some rights reserved (CC BY)
- 6. (c) molanic, some rights reserved (CC BY-NC), uploaded by molanic
- 7. (c) Lee Elliott, some rights reserved (CC BY-NC-SA), uploaded by Lee Elliott
- 8. (c) Eric Cormier, some rights reserved (CC BY-NC), uploaded by Eric Cormier
- 9. (c) Sean McCann, some rights reserved (CC BY-NC-SA)
- 10. (c) J. Michael Raby, some rights reserved (CC BY-NC-ND)
- 11. (c) David Hill, some rights reserved (CC BY)
- 12. (c) Lena Struwe, some rights reserved (CC BY-SA), uploaded by Lena Struwe
- 13. (c) Omayra, some rights reserved (CC BY-NC), uploaded by Omayra
- 14. (c) Shelia Hargis, some rights reserved (CC BY-NC), uploaded by Shelia Hargis
- 15. (c) Russell Pfau, some rights reserved (CC BY-NC), uploaded by Russell Pfau
- 16. (c) Carolyn Gritzmaker, some rights reserved (CC BY-NC), uploaded by Carolyn Gritzmaker
- 17. (c) Jenn Forman Orth, some rights reserved (CC BY-NC-SA)
- 18. (c) Jeffrey G. Cramer, some rights reserved (CC BY-NC), uploaded by Jeffrey G. Cramer
- 19. (c) Damon Tighe, some rights reserved (CC BY-NC), uploaded by Damon Tighe
- 20. (c) cotinis, some rights reserved (CC BY-NC-SA)
- 21. (c) kestrel360, some rights reserved (CC BY-NC-ND)
- 22. (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick
- 23. (c) Ted MacRae, some rights reserved (CC BY-NC-ND)
- 24. (c) Paul Bedell, some rights reserved (CC BY-SA), uploaded by Paul Bedell
- 25. no rights reserved, uploaded by Alejandro Santillana
- 26. (c) David G. Barker, some rights reserved (CC BY-NC), uploaded by David G. Barker
- 27. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 28. (c) Buddy, some rights reserved (CC BY-NC), uploaded by Buddy
- 29. (c) Annika Lindqvist, some rights reserved (CC BY), uploaded by Annika Lindqvist
- 30. (c) tybird99, some rights reserved (CC BY-NC), uploaded by tybird99
- 31. (c) Jason M Crockwell, some rights reserved (CC BY-NC-ND), uploaded by Jason M Crockwell
- 32. (c) Ilona L, some rights reserved (CC BY-NC-SA)
- 33. (c) krancmm, some rights reserved (CC BY-NC), uploaded by krancmm
- 34. (c) Elizabeth Rosenauer, some rights reserved (CC BY-NC), uploaded by Elizabeth Rosenauer
- 35. (c) David Illig, some rights reserved (CC BY-NC-SA)
- 36. (c) Sarah Zukoff, some rights reserved (CC BY)
- 37. (c) John B., some rights reserved (CC BY)
- 38. (c) Kai Joaquin, some rights reserved (CC BY-NC), uploaded by Kai Joaquin
- 39. (c) Royal Tyler, some rights reserved (CC BY-NC-SA), uploaded by Royal Tyler
- 40. (c) psweet, some rights reserved (CC BY-SA), uploaded by psweet
- 41. (c) Meghan Cassidy, some rights reserved (CC BY-SA), uploaded by Meghan Cassidy
- 42. (c) Paul Bedell, some rights reserved (CC BY-NC-SA)
- 43. (c) Damiano, some rights reserved (CC BY-NC-ND), uploaded by Damiano
- 44. (c) Curtis Eckerman, some rights reserved (CC BY-NC), uploaded by Curtis Eckerman
- 45. (c) Thomas Koffel, some rights reserved (CC BY), uploaded by Thomas Koffel
- 46. (c) Victor W Fazio III, some rights reserved (CC BY-NC), uploaded by Victor W Fazio III
- 47. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 48. (c) Eduardo Axel Recillas Bautista, some rights reserved (CC BY-NC), uploaded by Eduardo Axel Recillas Bautista
- 49. (c) Theresa Bayoud, all rights reserved, uploaded by Theresa Bayoud
- 50. (c) Edwin M Escobar, some rights reserved (CC BY-NC)
- 51. (c) Chuck Sexton, some rights reserved (CC BY-NC), uploaded by Chuck Sexton
- 52. (c) Royal Tyler, some rights reserved (CC BY-NC-SA)
- 53. no rights reserved, uploaded by Jesse Rorabaugh
- 54. no rights reserved, uploaded by Scott Loarie
- 55. (c) Bob O'Kennon, some rights reserved (CC BY-NC), uploaded by Bob O'Kennon
- 56. (c) David Wilson, some rights reserved (CC BY-NC), uploaded by David Wilson
- 57. (c) Kyhl Austin, some rights reserved (CC BY-NC), uploaded by Kyhl Austin
- 58. (c) Victor W Fazio III, some rights reserved (CC BY-NC-ND), uploaded by Victor W Fazio III
- 59. (c) Kevin Metcalf, some rights reserved (CC BY-NC), uploaded by Kevin Metcalf
- 60. (c) Mike Quinn, Austin, TX, some rights reserved (CC BY-NC), uploaded by Mike Quinn, Austin, TX