Photos:
- 1. (c) Katja Schulz, some rights reserved (CC BY)
- 2. (c) Keith Roragen, some rights reserved (CC BY-NC-SA)
- 3. (c) Luciano 95, some rights reserved (CC BY-NC-SA)
- 4. (c) zufi, some rights reserved (CC BY-NC)
- 5. (c) Royal Tyler, some rights reserved (CC BY-NC-SA)
- 6. (c) Jonathan (JC) Carpenter, some rights reserved (CC BY-NC), uploaded by Jonathan (JC) Carpenter
- 7. (c) Martin R. Lucas, some rights reserved (CC BY-NC), uploaded by Martin R. Lucas
- 8. (c) molanic, some rights reserved (CC BY-NC), uploaded by molanic
- 9. (c) isaias724, some rights reserved (CC BY-NC)
- 10. (c) Robert, some rights reserved (CC BY-NC)
- 11. (c) Sean McCann, some rights reserved (CC BY-NC-SA)
- 12. (c) Lee Elliott, some rights reserved (CC BY-NC-SA), uploaded by Lee Elliott
- 13. (c) Kerry Matz, some rights reserved (CC BY-NC-SA)
- 14. (c) Sam McNally, some rights reserved (CC BY-NC), uploaded by Sam McNally
- 15. (c) Bob Peterson, some rights reserved (CC BY-NC-SA)
- 16. (c) Mary Keim, some rights reserved (CC BY-NC-SA)
- 17. (c) A. Jaszlics, some rights reserved (CC BY-NC)
- 18. (c) Steven Severinghaus, some rights reserved (CC BY-NC-SA)
- 19. (c) Beth Katz, some rights reserved (CC BY-NC-SA), uploaded by Beth Katz
- 20. (c) Stott Noble, some rights reserved (CC BY-NC), uploaded by Stott Noble
- 21. (c) Alex Bairstow, some rights reserved (CC BY-NC), uploaded by Alex Bairstow
- 22. (c) Monica Krancevic, some rights reserved (CC BY-NC), uploaded by Monica Krancevic
- 23. (c) Ilona L, some rights reserved (CC BY-NC-SA)
- 24. (c) Udo Schmidt, some rights reserved (CC BY-NC-SA)
- 25. (c) Robby Deans, some rights reserved (CC BY-NC), uploaded by Robby Deans
- 26. (c) Celeste Ramsay, some rights reserved (CC BY-NC-ND)
- 27. (c) J. Michael Raby, some rights reserved (CC BY-NC-ND)
- 28. (c) David Hill, some rights reserved (CC BY)
- 29. (c) Anita363, some rights reserved (CC BY-NC)
- 30. no rights reserved, uploaded by Jesse Rorabaugh
- 31. (c) Jason M Crockwell, some rights reserved (CC BY-NC-ND), uploaded by Jason M Crockwell
- 32. (c) Lena Struwe, some rights reserved (CC BY-SA), uploaded by Lena Struwe
- 33. (c) Chuck Sexton, some rights reserved (CC BY-NC), uploaded by Chuck Sexton
- 34. (c) cyric, some rights reserved (CC BY-NC-SA), uploaded by cyric
- 35. (c) Bob Peterson, some rights reserved (CC BY-SA)
- 36. (c) John P Friel, some rights reserved (CC BY), uploaded by John P Friel
- 37. (c) Omayra, some rights reserved (CC BY-NC), uploaded by Omayra
- 38. (c) 106584015630019574849, some rights reserved (CC BY-NC-SA), uploaded by 106584015630019574849
- 39. (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick
- 40. (c) Shelia Hargis, some rights reserved (CC BY-NC), uploaded by Shelia Hargis
- 41. (c) John Flannery, some rights reserved (CC BY-SA)
- 42. (c) Marc AuMarc, some rights reserved (CC BY-NC-ND)
- 43. (c) Judy Gallagher, some rights reserved (CC BY), uploaded by Judy Gallagher
- 44. (c) cotinis, some rights reserved (CC BY-NC-SA)
- 45. (c) Russell Pfau, some rights reserved (CC BY-NC), uploaded by Russell Pfau
- 46. (c) Eric Carpenter, some rights reserved (CC BY-NC), uploaded by Eric Carpenter
- 47. (c) Cheryl Harleston López Espino, some rights reserved (CC BY-NC-ND), uploaded by Cheryl Harleston López Espino
- 48. (c) Even Dankowicz, some rights reserved (CC BY), uploaded by Even Dankowicz
- 49. (c) Carolyn Gritzmaker, some rights reserved (CC BY-NC), uploaded by Carolyn Gritzmaker
- 50. (c) Jenn Forman Orth, some rights reserved (CC BY-NC-SA)
- 51. (c) Jeffrey G. Cramer, some rights reserved (CC BY-NC), uploaded by Jeffrey G. Cramer
- 52. no rights reserved
- 53. (c) Royal Tyler, some rights reserved (CC BY-NC-SA), uploaded by Royal Tyler
- 54. (c) promiseminime, some rights reserved (CC BY)
- 55. (c) Damon Tighe, some rights reserved (CC BY-NC), uploaded by Damon Tighe
- 56. (c) Katja Schulz, some rights reserved (CC BY), uploaded by Katja Schulz
- 57. (c) Robert Simons, some rights reserved (CC BY-NC), uploaded by Robert Simons
- 58. (c) Tracey Fandre, some rights reserved (CC BY-NC-ND), uploaded by Tracey Fandre
- 59. (c) Annika Lindqvist, some rights reserved (CC BY), uploaded by Annika Lindqvist
- 60. no rights reserved, uploaded by Alejandro Santillana
- 61. (c) Julián-Caballero C. Camilo, some rights reserved (CC BY), uploaded by Julián-Caballero C. Camilo
- 62. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 63. (c) Eric Keith, some rights reserved (CC BY-NC), uploaded by Eric Keith
- 64. (c) Jeff McIntyre, some rights reserved (CC BY-NC), uploaded by Jeff McIntyre
- 65. (c) Tony Palmer, some rights reserved (CC BY-NC), uploaded by Tony Palmer
- 66. (c) Buddy, some rights reserved (CC BY-NC), uploaded by Buddy
- 67. (c) Dusty, some rights reserved (CC BY-NC), uploaded by Dusty
- 68. no rights reserved, uploaded by Robb Hannawacker
- 69. (c) tybird99, some rights reserved (CC BY-NC), uploaded by tybird99
- 70. (c) Lynn Seman, some rights reserved (CC BY-NC), uploaded by Lynn Seman
- 71. (c) Emily Hjalmarson, some rights reserved (CC BY-NC), uploaded by Emily Hjalmarson
- 72. (c) magdastlucia, some rights reserved (CC BY-NC), uploaded by magdastlucia
- 73. (c) Philipp Wickey, all rights reserved, uploaded by Philipp Wickey
- 74. (c) skitterbug, some rights reserved (CC BY), uploaded by skitterbug
- 75. (c) Debra Halter, some rights reserved (CC BY-NC), uploaded by Debra Halter
- 76. (c) G. L. Dearman, some rights reserved (CC BY-NC), uploaded by G. L. Dearman
- 77. (c) James Shelton, some rights reserved (CC BY-NC-SA), uploaded by James Shelton
- 78. (c) Lic. Kevin Miguel Garibaldi Fierro, some rights reserved (CC BY), uploaded by Lic. Kevin Miguel Garibaldi Fierro
- 79. (c) Lena Zappia, some rights reserved (CC BY-NC), uploaded by Lena Zappia
- 80. (c) Anita Gould, some rights reserved (CC BY-NC), uploaded by Anita Gould
- 81. (c) Clemson University, some rights reserved (CC BY)
- 82. (c) Fredlyfish4, some rights reserved (CC BY-SA)
- 83. (c) David Illig, some rights reserved (CC BY-NC-SA)
- 84. (c) Sarah Zukoff, some rights reserved (CC BY)
- 85. (c) Brian Loflin, some rights reserved (CC BY-NC), uploaded by Brian Loflin
- 86. (c) John B., some rights reserved (CC BY)
- 87. (c) Jason King, some rights reserved (CC BY-NC), uploaded by Jason King
- 88. (c) Kai Joaquin, some rights reserved (CC BY-NC), uploaded by Kai Joaquin
- 89. (c) John Sear, some rights reserved (CC BY-NC), uploaded by John Sear
- 90. (c) psweet, some rights reserved (CC BY-SA), uploaded by psweet
- 91. (c) Paul Bedell, some rights reserved (CC BY-SA), uploaded by Paul Bedell
- 92. (c) Meghan Cassidy, some rights reserved (CC BY-SA), uploaded by Meghan Cassidy
- 93. (c) Damiano, some rights reserved (CC BY-NC-ND), uploaded by Damiano
- 94. (c) Rob Curtis, some rights reserved (CC BY-NC-SA), uploaded by Rob Curtis
- 95. (c) Philip Woods, some rights reserved (CC BY-NC), uploaded by Philip Woods
- 96. (c) Sheryl Smith-Rodgers, some rights reserved (CC BY-NC), uploaded by Sheryl Smith-Rodgers
- 97. (c) Brush F, some rights reserved (CC BY-NC), uploaded by Brush F
- 98. (c) Melanie Schuchart, some rights reserved (CC BY-NC), uploaded by Melanie Schuchart
- 99. (c) Lori Smith, some rights reserved (CC BY-NC-ND)
- 100. (c) Juan Cruzado Cortés, some rights reserved (CC BY-SA), uploaded by Juan Cruzado Cortés
- 101. (c) Elizabeth Green, some rights reserved (CC BY-NC), uploaded by Elizabeth Green
- 102. (c) Curtis Eckerman, some rights reserved (CC BY-NC), uploaded by Curtis Eckerman
- 103. (c) Bob O'Kennon, some rights reserved (CC BY-NC), uploaded by Bob O'Kennon
- 104. (c) Marvin Smith, some rights reserved (CC BY-NC), uploaded by Marvin Smith
- 105. (c) Victor W Fazio III, some rights reserved (CC BY-NC), uploaded by Victor W Fazio III
- 106. (c) Judy Gallagher, some rights reserved (CC BY)
- 107. (c) Eduardo Axel Recillas Bautista, some rights reserved (CC BY-NC), uploaded by Eduardo Axel Recillas Bautista
- 108. (c) Karen Yukich, some rights reserved (CC BY-NC), uploaded by Karen Yukich
- 109. (c) Cullen Hanks, some rights reserved (CC BY-NC), uploaded by Cullen Hanks
- 110. (c) James Bailey, some rights reserved (CC BY-NC), uploaded by James Bailey
- 111. (c) Theresa Bayoud, all rights reserved, uploaded by Theresa Bayoud
- 112. (c) evelynsm, some rights reserved (CC BY-NC)
- 113. (c) Edwin M Escobar, some rights reserved (CC BY-NC)
- 114. (c) Samantha Jones, some rights reserved (CC BY-NC), uploaded by Samantha Jones
- 115. (c) Jon McIntyre, some rights reserved (CC BY-NC), uploaded by Jon McIntyre
- 116. (c) Carlos G Velazco-Macias, some rights reserved (CC BY-NC), uploaded by Carlos G Velazco-Macias
- 117. (c) thedlund, some rights reserved (CC BY-NC), uploaded by thedlund
- 118. (c) Bill Lucas, some rights reserved (CC BY-NC), uploaded by Bill Lucas
- 119. (c) Maria G. Price, some rights reserved (CC BY-NC), uploaded by Maria G. Price
- 120. (c) Xanett Aguilar Izaguirre, some rights reserved (CC BY-NC), uploaded by Xanett Aguilar Izaguirre
- 121. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
- 122. (c) Linda Jo Conn, some rights reserved (CC BY-NC), uploaded by Linda Jo Conn
- 123. (c) AJ Johnson, some rights reserved (CC BY-NC), uploaded by AJ Johnson
- 124. (c) Cassi, some rights reserved (CC BY-NC), uploaded by Cassi
- 125. (c) 104860852614073572279, some rights reserved (CC BY-NC-SA), uploaded by 104860852614073572279
- 126. (c) Sam Ashley, some rights reserved (CC BY-NC), uploaded by Sam Ashley
- 127. (c) Victor W Fazio III, some rights reserved (CC BY-NC-ND), uploaded by Victor W Fazio III
- 128. (c) birdladymilam, some rights reserved (CC BY-NC)
- 129. (c) serracaris, some rights reserved (CC BY-NC), uploaded by serracaris
- 130. (c) Mike Quinn, Austin, TX, some rights reserved (CC BY-NC), uploaded by Mike Quinn, Austin, TX
- 131. (c) Eric Isley, some rights reserved (CC BY-NC), uploaded by Eric Isley
- 132. (c) Lori Smith, some rights reserved (CC BY-NC-SA)
- 133. (c) Stuart Tingley, some rights reserved (CC BY-NC), uploaded by Stuart Tingley
- 134. (c) Robert Lord Zimlich, some rights reserved (CC BY-NC), uploaded by Robert Lord Zimlich
- 135. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 136. (c) Judith Ellen Lopez, some rights reserved (CC BY-NC)
- 137. (c) Jane Percival, some rights reserved (CC BY-NC-SA), uploaded by Jane Percival
- 138. (c) Trinity River NWR, some rights reserved (CC BY-NC-ND), uploaded by Trinity River NWR
- 139. (c) BJ Stacey, some rights reserved (CC BY-NC), uploaded by BJ Stacey
- 140. (c) Robert J. "Bob" Nuelle, Jr. AICEZS, some rights reserved (CC BY-NC), uploaded by Robert J. "Bob" Nuelle, Jr. AICEZS
- 141. (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block
- 142. (c) griff, some rights reserved (CC BY-NC), uploaded by griff
- 143. (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr
- 144. (c) Brent Franklin, some rights reserved (CC BY-NC), uploaded by Brent Franklin
- 145. (c) Matthew Pintar, some rights reserved (CC BY), uploaded by Matthew Pintar
- 146. (c) xpda, some rights reserved (CC BY-SA)
- 147. (c) Matt Muir, some rights reserved (CC BY-SA)
- 148. (c) Roger Shaw, some rights reserved (CC BY-NC-SA)
- 149. (c) EEKB, some rights reserved (CC BY-NC-SA), uploaded by EEKB
- 150. (c) Joshua Doby, some rights reserved (CC BY-NC), uploaded by Joshua Doby
- 151. (c) latimeria-co, some rights reserved (CC BY-NC), uploaded by latimeria-co
- 152. (c) blake hendon, some rights reserved (CC BY-NC), uploaded by blake hendon
- 153. (c) Ramiro Gonzalez, some rights reserved (CC BY-NC), uploaded by Ramiro Gonzalez
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