Photos:
- 1. (c) Benjamin Schwartz, some rights reserved (CC BY-NC), uploaded by Benjamin Schwartz
- 2. (c) Ilona Loser, some rights reserved (CC BY-NC-SA)
- 3. (c) Stuart Tingley, some rights reserved (CC BY-NC), uploaded by Stuart Tingley
- 4. (c) Chuck Sexton, some rights reserved (CC BY-NC), uploaded by Chuck Sexton
- 5. (c) Cyndy Sims Parr, some rights reserved (CC BY-SA), uploaded by Cyndy Sims Parr
- 6. (c) Katja Schulz, some rights reserved (CC BY)
- 7. (c) Jeff Skrentny, some rights reserved (CC BY-NC), uploaded by Jeff Skrentny
- 8. (c) bob15noble, some rights reserved (CC BY-NC), uploaded by bob15noble
- 9. (c) Jason Eckberg, some rights reserved (CC BY-NC), uploaded by Jason Eckberg
- 10. (c) tnewman, some rights reserved (CC BY-NC)
- 11. (c) Didier Descouens, some rights reserved (CC BY-SA)
- 12. (c) Kristi DuBois, some rights reserved (CC BY-NC), uploaded by Kristi DuBois
- 13. (c) Janice Arndt, some rights reserved (CC BY-NC), uploaded by Janice Arndt
- 14. (c) Sam Fellows, some rights reserved (CC BY-NC), uploaded by Sam Fellows
- 15. (c) Susan Elliott, some rights reserved (CC BY-NC), uploaded by Susan Elliott
- 16. (c) Robert Young, some rights reserved (CC BY)
- 17. (c) Jim & Lynne Weber, some rights reserved (CC BY-NC), uploaded by Jim & Lynne Weber
- 18. (c) John P Friel, some rights reserved (CC BY), uploaded by John P Friel
- 19. (c) anonymous, some rights reserved (CC BY-SA)
- 20. (c) nolieschneider, some rights reserved (CC BY-NC), uploaded by nolieschneider
- 21. (c) Seabrooke Leckie, some rights reserved (CC BY-NC-ND)
- 22. (c) Jim Johnson, some rights reserved (CC BY-NC-ND), uploaded by Jim Johnson
- 23. (c) Laura Gaudette, some rights reserved (CC BY), uploaded by Laura Gaudette
- 24. (c) Bob Travis, some rights reserved (CC BY-NC)
- 25. (c) David Bygott, some rights reserved (CC BY-NC-SA)
- 26. (c) John Flannery, some rights reserved (CC BY-SA)
- 27. (c) Angie Shyrigh, some rights reserved (CC BY-NC)
- 28. (c) G. L. Dearman, some rights reserved (CC BY-NC), uploaded by G. L. Dearman
- 29. (c) Matt Reinbold, some rights reserved (CC BY-SA)
- 30. (c) ColoradEO, some rights reserved (CC BY-NC)
- 31. (c) Sean McCann, some rights reserved (CC BY-NC-SA)
- 32. (c) Kat Halsey, some rights reserved (CC BY-NC), uploaded by Kat Halsey
- 33. (c) Jim Vargo at Moth Photographers Group, some rights reserved (CC BY-NC-SA)
- 34. (c) Ken-ichi Ueda, some rights reserved (CC BY)
- 35. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 36. (c) Anita, some rights reserved (CC BY-NC)
- 37. (c) Gilles San Martin, some rights reserved (CC BY-SA)
- 38. (c) johnvillella, some rights reserved (CC BY-NC-SA)
- 39. (c) Steve L. Martin, some rights reserved (CC BY)
- 40. (c) D. Gordon E. Robertson, some rights reserved (CC BY-SA)
- 41. (c) Peter Prehn, some rights reserved (CC BY-NC-ND)
- 42. (c) Franco Folini, some rights reserved (CC BY)
- 43. (c) Ken Slade, some rights reserved (CC BY-NC)
- 44. (c) Jacob Bell, some rights reserved (CC BY-NC), uploaded by Jacob Bell
- 45. (c) brian lee clements, some rights reserved (CC BY-NC)
- 46. (c) cotinis, some rights reserved (CC BY-NC-SA)
- 47. (c) Paul Bedell, some rights reserved (CC BY-NC-SA)
- 48. (c) José Belem Hernández Díaz, some rights reserved (CC BY), uploaded by José Belem Hernández Díaz
- 49. (c) Brian Peterson, some rights reserved (CC BY-NC-ND)
- 50. Northern Prairie Wildlife Research Center, USGS, no known copyright restrictions (public domain)
- 51. (c) tomoclark, some rights reserved (CC BY-NC), uploaded by tomoclark
- 52. (c) Anne, some rights reserved (CC BY-NC-SA)
- 53. (c) Bill Bouton, some rights reserved (CC BY-SA)
- 54. (c) Jeffrey Pippen, some rights reserved (CC BY-NC-SA)
- 55. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
- 56. (c) Jason Forbes, some rights reserved (CC BY-NC-ND)
- 57. (c) Catherine Cook, some rights reserved (CC BY-NC-ND)
- 58. (c) Bill Bouton, some rights reserved (CC BY-NC-ND)
- 59. (c) Paul Cools, some rights reserved (CC BY-NC), uploaded by Paul Cools
- 60. (c) Kerry Matz, some rights reserved (CC BY-NC-SA)
- 61. (c) summerazure, some rights reserved (CC BY-NC-SA)
- 62. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 63. (c) msr, some rights reserved (CC BY-NC), uploaded by msr
- 64. (c) Charles Bordelon and Ed Knudson, some rights reserved (CC BY)
- 65. (c) Robert J. "Bob" Nuelle, Jr. AICEZS, some rights reserved (CC BY-NC), uploaded by Robert J. "Bob" Nuelle, Jr. AICEZS
- 66. (c) Bill Carrell, some rights reserved (CC BY-NC-ND), uploaded by Bill Carrell
- 67. (c) roy pilcher, some rights reserved (CC BY-NC), uploaded by roy pilcher
- 68. (c) Bill Bouton, some rights reserved (CC BY-NC)
- 69. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 70. (c) JoeD, some rights reserved (CC BY-NC), uploaded by JoeD
- 71. (c) Rob Van Epps, some rights reserved (CC BY-NC), uploaded by Rob Van Epps
- 72. (c) David Andreas De Rivera Tønnessen, some rights reserved (CC BY-NC), uploaded by David Andreas De Rivera Tønnessen
- 73. (c) cwwood, some rights reserved (CC BY-SA), uploaded by cwwood
- 74. (c) Robb Hannawacker, some rights reserved (CC BY-NC-SA)
- 75. (c) cyric, some rights reserved (CC BY-NC-SA), uploaded by cyric
- 76. (c) Kris Hazelbaker, some rights reserved (CC BY-NC-SA), uploaded by Kris Hazelbaker
- 77. (c) Kerry Givens, some rights reserved (CC BY-NC), uploaded by Kerry Givens
- 78. (c) Biodiversity Institute, some rights reserved (CC BY-NC-ND)
- 79. (c) Celeste Ramsay, some rights reserved (CC BY-NC-ND)
- 80. (c) Emily Hjalmarson, some rights reserved (CC BY-NC), uploaded by Emily Hjalmarson
- 81. (c) 104860852614073572279, some rights reserved (CC BY-NC-SA), uploaded by 104860852614073572279
- 82. (c) Mark Rosenstein, some rights reserved (CC BY-NC-SA), uploaded by Mark Rosenstein
- 83. (c) Benny Mazur, some rights reserved (CC BY)
- 84. (c) Erin McKiernan, some rights reserved (CC BY-NC-ND), uploaded by Erin McKiernan
- 85. (c) Sam McNally, some rights reserved (CC BY-NC), uploaded by Sam McNally
- 86. (c) Patrick Dockens, some rights reserved (CC BY-NC-ND)
- 87. (c) Gilles Gonthier, some rights reserved (CC BY)
- 88. (c) Jim P. Brock, some rights reserved (CC BY-NC-SA)
- 89. (c) Bill Bouton, some rights reserved (CC BY-NC-SA)
- 90. (c) Shanthanu Bhardwaj, some rights reserved (CC BY-SA)
- 91. (c) upupamartin, some rights reserved (CC BY-NC-ND), uploaded by upupamartin
- 92. (c) C. A. Ivy, some rights reserved (CC BY-NC), uploaded by C. A. Ivy
- 93. (c) Robert, some rights reserved (CC BY-NC)
- 94. no rights reserved, uploaded by Patrick Alexander
- 95. (c) David Hofmann, some rights reserved (CC BY-NC-ND)
- 96. (c) Drriss & Marrionn, some rights reserved (CC BY-NC-SA)
- 97. (c) dloarie, some rights reserved (CC BY), uploaded by dloarie
- 98. (c) Anne Toal, some rights reserved (CC BY)
- 99. (c) Aleta Rodriguez, some rights reserved (CC BY-NC-ND)
- 100. (c) Don Loarie, some rights reserved (CC BY), uploaded by Don Loarie
- 101. (c) Mike Leveille, some rights reserved (CC BY-NC), uploaded by Mike Leveille
- 102. (c) J. N. Stuart, some rights reserved (CC BY-NC-ND)
- 103. (c) Paul G. Johnson, some rights reserved (CC BY-NC-SA), uploaded by Paul G. Johnson
- 104. (c) Kaitlin Backlund, some rights reserved (CC BY-NC-ND), uploaded by Kaitlin Backlund
- 105. (c) Kent McFarland, some rights reserved (CC BY-NC)
- 106. (c) Zac Cota, some rights reserved (CC BY-NC), uploaded by Zac Cota
- 107. (c) Bill Bumgarner, some rights reserved (CC BY-NC-ND)
- 108. (c) Alan Liang, some rights reserved (CC BY-NC), uploaded by Alan Liang
- 109. (c) Liam O'Brien, some rights reserved (CC BY-NC), uploaded by Liam O'Brien
- 110. ALAN SCHMIERER, no known copyright restrictions (public domain)
- 111. (c) Bonnie Kinder, some rights reserved (CC BY-NC), uploaded by Bonnie Kinder
- 112. (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block
- 113. (c) Phil Myers, some rights reserved (CC BY-NC-SA)
- 114. (c) Joe McKenna, some rights reserved (CC BY)
- 115. (c) Rob Curtis, some rights reserved (CC BY-NC-SA), uploaded by Rob Curtis
- 116. (c) Tim Guida, some rights reserved (CC BY-NC), uploaded by Tim Guida
- 117. (c) JerryFriedman, some rights reserved (CC BY-SA)
- 118. (c) Paul Thompson, some rights reserved (CC BY-NC-ND)
- 119. no rights reserved, uploaded by Kent McFarland
- 120. (c) danielle_stephens, some rights reserved (CC BY-NC)
- 121. (c) Roberto Sindaco, some rights reserved (CC BY-NC-SA), uploaded by Roberto Sindaco
- 122. (c) Mary Keim, some rights reserved (CC BY-NC-SA)
- 123. (c) Cheryl Harleston López Espino, some rights reserved (CC BY-NC-ND), uploaded by Cheryl Harleston López Espino
- 124. (c) TexasEagle, some rights reserved (CC BY-NC)
- 125. (c) ktratboy, some rights reserved (CC BY-ND)
- 126. (c) Pam Piombino, some rights reserved (CC BY-NC), uploaded by Pam Piombino
- 127. (c) Jason M Crockwell, some rights reserved (CC BY-NC-ND), uploaded by Jason M Crockwell
- 128. (c) Leslie Flint, some rights reserved (CC BY-NC), uploaded by Leslie Flint
- 129. (c) ebrunquist, some rights reserved (CC BY-NC)
- 130. (c) Bob Danley, some rights reserved (CC BY-NC)
- 131. (c) icosahedron, some rights reserved (CC BY), uploaded by icosahedron
- 132. (c) 2011 Dianne Fristrom, some rights reserved (CC BY-SA)
- 133. (c) Jerry Friedman, some rights reserved (CC BY-SA)
- 134. (c) Brad Smith, some rights reserved (CC BY-NC)
- 135. (c) sea-kangaroo, some rights reserved (CC BY-NC-ND), uploaded by sea-kangaroo
- 136. (c) Cook Cottage, some rights reserved (CC BY-NC-ND)
- 137. (c) pondhawk, some rights reserved (CC BY)
- 138. (c) Pacific Southwest Region U.S. Fish and Wildlife Service, some rights reserved (CC BY)
- 139. (c) Anne Reeves, some rights reserved (CC BY-ND)
- 140. (c) Jérôme Albre, some rights reserved (CC BY)
- 141. (c) James Bailey, some rights reserved (CC BY-NC), uploaded by James Bailey
- 142. (c) Dan Mullen, some rights reserved (CC BY-NC-ND)
- 143. (c) Biodiveristy Institute, some rights reserved (CC BY-NC-ND)
- 144. (c) Louis Shackleton, some rights reserved (CC BY-NC-SA)
- 145. (c) aarongunnar, some rights reserved (CC BY), uploaded by aarongunnar
- 146. (c) Marcello Consolo, some rights reserved (CC BY-NC-SA)
- 147. (c) Barbara Charlton, some rights reserved (CC BY-NC), uploaded by Barbara Charlton
- 148. (c) C. Mallory, some rights reserved (CC BY-NC), uploaded by C. Mallory
- 149. (c) nutmeg66, some rights reserved (CC BY-NC-ND)
- 150. (c) Dick, some rights reserved (CC BY-NC-SA)
- 151. (c) jonnx12, some rights reserved (CC BY-SA)
- 152. (c) arabelleosicky, some rights reserved (CC BY-NC), uploaded by arabelleosicky
- 153. (c) leptim, some rights reserved (CC BY-NC)
- 154. (c) kens18, some rights reserved (CC BY-NC), uploaded by kens18
- 155. (c) Mike V.A. Burrell, some rights reserved (CC BY-NC), uploaded by Mike V.A. Burrell
- 156. (c) Paul Tavares, some rights reserved (CC BY-NC), uploaded by Paul Tavares
- 157. (c) fydnar, some rights reserved (CC BY-NC), uploaded by fydnar
- 158. (c) Anita Gould, some rights reserved (CC BY-NC), uploaded by Anita Gould
- 159. (c) jlentz, some rights reserved (CC BY-NC)
- 160. (c) Donald Hobern, some rights reserved (CC BY)
- 161. (c) Royal Tyler, some rights reserved (CC BY-NC-SA), uploaded by Royal Tyler
- 162. (c) Monica Krancevic, some rights reserved (CC BY-NC), uploaded by Monica Krancevic
- 163. (c) Mark Olivier, some rights reserved (CC BY-NC), uploaded by Mark Olivier
- 164. (c) dhobern, some rights reserved (CC BY)
- 165. (c) Kent Miller, some rights reserved (CC BY-ND), uploaded by Kent Miller
- 166. (c) Mick Talbot, some rights reserved (CC BY-NC), uploaded by Mick Talbot
- 167. (c) Steve Jurvetson, some rights reserved (CC BY)
- 168. (c) Patrick Coin, some rights reserved (CC BY-NC-SA)
- 169. (c) Heidi Eaton, some rights reserved (CC BY-NC), uploaded by Heidi Eaton
- 170. (c) Royal Tyler, some rights reserved (CC BY-NC-SA)
- 171. (c) paul_dennehy, some rights reserved (CC BY-NC), uploaded by paul_dennehy
- 172. (c) Denis Doucet, some rights reserved (CC BY-NC), uploaded by Denis Doucet
- 173. (c) Diana-Terry Hibbitts, some rights reserved (CC BY-NC), uploaded by Diana-Terry Hibbitts
- 174. (c) J. N. Stuart, all rights reserved, uploaded by J. N. Stuart
- 175. (c) Anita363, some rights reserved (CC BY-NC)
- 176. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal
- 177. Lake Mead NRA Public Affairs, no known copyright restrictions (public domain)
- 178. (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick
- 179. (c) Michelle Dyer, some rights reserved (CC BY-NC-SA)
- 180. (c) Fernando Valentinez, some rights reserved (CC BY-NC), uploaded by Fernando Valentinez
- 181. (c) hfricke, some rights reserved (CC BY-NC), uploaded by hfricke
- 182. (c) Patrick Coin, some rights reserved (CC BY-SA)
- 183. (c) Ronald Parry, some rights reserved (CC BY-NC), uploaded by Ronald Parry
- 184. (c) Shana Loshbaugh, some rights reserved (CC BY-NC), uploaded by Shana Loshbaugh
- 185. (c) Andy Reago & Chrissy McClarren, some rights reserved (CC BY)
- 186. (c) Ben Hutchins, some rights reserved (CC BY-NC), uploaded by Ben Hutchins
- 187. (c) Fyn Kynd, some rights reserved (CC BY-SA), uploaded by Fyn Kynd
- 188. (c) catchang, some rights reserved (CC BY-NC), uploaded by catchang
- 189. (c) David Kaposi, some rights reserved (CC BY-NC), uploaded by David Kaposi
- 190. (c) Ilona L, some rights reserved (CC BY-NC-SA)
- 191. (c) Dan Serpiello, some rights reserved (CC BY-NC), uploaded by Dan Serpiello
- 192. (c) Fyn Kynd, some rights reserved (CC BY)
- 193. (c) David Dodd, some rights reserved (CC BY), uploaded by David Dodd
- 194. (c) Tony Morris, some rights reserved (CC BY-NC)
- 195. (c) John Boback, some rights reserved (CC BY-NC), uploaded by John Boback
- 196. (c) Lena Zappia, some rights reserved (CC BY-NC), uploaded by Lena Zappia
- 197. (c) tapaculo99, some rights reserved (CC BY-NC), uploaded by tapaculo99
- 198. (c) Joshua Smith, some rights reserved (CC BY-NC), uploaded by Joshua Smith
- 199. (c) Kyle Jones, some rights reserved (CC BY-NC), uploaded by Kyle Jones
- 200. (c) Robert Webster, some rights reserved (CC BY-SA), uploaded by Robert Webster
- 201. (c) judywelna, some rights reserved (CC BY-NC), uploaded by judywelna
- 202. (c) Mark D. Read, some rights reserved (CC BY-NC), uploaded by Mark D. Read
- 203. (c) Andrew Block, some rights reserved (CC BY-NC), uploaded by Andrew Block
- 204. (c) Jenn Forman Orth, some rights reserved (CC BY-NC-SA)
- 205. (c) BJ Stacey, some rights reserved (CC BY-NC), uploaded by BJ Stacey
- 206. (c) Jeremy deWaard. University of British Columbia., some rights reserved (CC BY)
- 207. (c) John B., some rights reserved (CC BY)
- 208. (c) Jeremiah Caldwell, some rights reserved (CC BY-NC), uploaded by Jeremiah Caldwell
- 209. (c) Dan MacNeal, some rights reserved (CC BY), uploaded by Dan MacNeal
- 210. (c) adriscoll, some rights reserved (CC BY-NC), uploaded by adriscoll
- 211. (c) mark3939, some rights reserved (CC BY-NC), uploaded by mark3939
- 212. (c) Steve Taylor, some rights reserved (CC BY), uploaded by Steve Taylor
- 213. (c) Nathan Taylor, some rights reserved (CC BY-NC), uploaded by Nathan Taylor
- 214. (c) Annika Lindqvist, some rights reserved (CC BY), uploaded by Annika Lindqvist
- 215. (c) Lauren Harter, some rights reserved (CC BY-NC-SA), uploaded by Lauren Harter
- 216. (c) Ben Sale, some rights reserved (CC BY)
- 217. no rights reserved, uploaded by Kevin Keegan
- 218. (c) Scott Gilmore, some rights reserved (CC BY-NC), uploaded by Scott Gilmore
- 219. (c) Donna Fernstrom, some rights reserved (CC BY), uploaded by Donna Fernstrom
- 220. (c) Steve Nanz, some rights reserved (CC BY-NC), uploaded by Steve Nanz
- 221. (c) Cullen Hanks, some rights reserved (CC BY-NC), uploaded by Cullen Hanks
- 222. (c) Aaron Carlson, some rights reserved (CC BY), uploaded by Aaron Carlson
- 223. (c) Chris Grinter, some rights reserved (CC BY-NC), uploaded by Chris Grinter
- 224. (c) jneddermeyer, some rights reserved (CC BY-NC)
- 225. no rights reserved, uploaded by Zygy
- 226. (c) Lee Hoy, some rights reserved (CC BY-NC-ND), uploaded by Lee Hoy
- 227. (c) Paul Bedell, some rights reserved (CC BY-SA), uploaded by Paul Bedell
- 228. (c) Doug Macaulay, some rights reserved (CC BY-NC), uploaded by Doug Macaulay
- 229. (c) Don Loarie, some rights reserved (CC BY)
- 230. (c) Stott Noble, some rights reserved (CC BY-NC), uploaded by Stott Noble
- 231. (c) gailhampshire, some rights reserved (CC BY-NC-SA)
- 232. (c) Jonathan (JC) Carpenter, some rights reserved (CC BY-NC), uploaded by Jonathan (JC) Carpenter
- 233. (c) Steve Pelikan, some rights reserved (CC BY-NC), uploaded by Steve Pelikan
- 234. (c) Richard Crook, some rights reserved (CC BY-NC-ND)
- 235. (c) Paolo Mazzei, some rights reserved (CC BY-NC), uploaded by Paolo Mazzei
- 236. (c) bugger44, some rights reserved (CC BY-NC), uploaded by bugger44
- 237. no rights reserved
- 238. (c) edporopat, some rights reserved (CC BY-NC), uploaded by edporopat
- 239. (c) lu1sam4dor, some rights reserved (CC BY-NC)
- 240. (c) International Institute of Tropical Agriculture, some rights reserved (CC BY-NC)
- 241. (c) Van Truan, some rights reserved (CC BY-NC), uploaded by Van Truan
- 242. (c) University of British Columbia, some rights reserved (CC BY)
- 243. (c) Carla Kishinami, some rights reserved (CC BY-NC-ND)
- 244. (c) Alan Vernon, some rights reserved (CC BY-NC-SA)
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