Photos:
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- 2. (c) Matt Lavin, some rights reserved (CC BY-SA)
- 3. (c) Kerry Woods, some rights reserved (CC BY-NC-ND)
- 4. (c) alexlomas, some rights reserved (CC BY)
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- 7. (c) Felipe Gómez, some rights reserved (CC BY-NC), uploaded by Felipe Gómez
- 8. (c) Nicola van Berkel, some rights reserved (CC BY-SA), uploaded by Nicola van Berkel
- 9. (c) nancyed, some rights reserved (CC BY-NC), uploaded by nancyed
- 10. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
- 11. (c) Susan J. Hewitt, some rights reserved (CC BY-NC), uploaded by Susan J. Hewitt
- 12. (c) Cullen Hanks, some rights reserved (CC BY-NC), uploaded by Cullen Hanks
- 13. (c) Alex Melman, some rights reserved (CC BY-NC-SA)
- 14. (c) Milo Pyne, some rights reserved (CC BY-NC), uploaded by Milo Pyne
- 15. (c) Alicia Pimental, some rights reserved (CC BY)
- 16. (c) Carmen Thierry, some rights reserved (CC BY-NC), uploaded by Carmen Thierry
- 17. (c) Bren Ledbetter, some rights reserved (CC BY-NC), uploaded by Bren Ledbetter
- 18. (c) Fritz Flohr Reynolds, some rights reserved (CC BY-SA)
- 19. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 20. (c) John Lillis, some rights reserved (CC BY-NC-ND)
- 21. (c) Joshua Tree National Park, some rights reserved (CC BY)
- 22. (c) Martin LaBar, some rights reserved (CC BY-NC)
- 23. (c) Anita363, some rights reserved (CC BY-NC)
- 24. (c) John Tann, some rights reserved (CC BY)
- 25. (c) Andreas Rockstein, some rights reserved (CC BY-NC), uploaded by Andreas Rockstein
- 26. (c) Jakob Fahr, some rights reserved (CC BY-NC), uploaded by Jakob Fahr
- 27. (c) Laura Clark, some rights reserved (CC BY), uploaded by Laura Clark
- 28. (c) Ashley M Bradford, some rights reserved (CC BY-NC), uploaded by Ashley M Bradford
- 29. (c) Sarah Gregg, some rights reserved (CC BY-NC)
- 30. (c) 2008 Zoya Akulova, some rights reserved (CC BY-NC)
- 31. (c) ellen hildebrandt, some rights reserved (CC BY-NC), uploaded by ellen hildebrandt
- 32. (c) emily, some rights reserved (CC BY-NC-SA)
- 33. (c) Steve Chilton, some rights reserved (CC BY-NC-ND)
- 34. (c) Tony Rodd, some rights reserved (CC BY-NC-SA)
- 35. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 36. (c) Gravitywave, some rights reserved (CC BY-NC-SA)
- 37. (c) Jörg Hempel, some rights reserved (CC BY-SA)
- 38. (c) Susan Elliott, some rights reserved (CC BY-NC), uploaded by Susan Elliott
- 39. (c) Victor W Fazio III, some rights reserved (CC BY-NC), uploaded by Victor W Fazio III
- 40. (c) Judith Ellen Lopez, some rights reserved (CC BY-NC)
- 41. (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick
- 42. (c) Jenny Smith, some rights reserved (CC BY-NC), uploaded by Jenny Smith
- 43. (c) Bob O'Kennon, some rights reserved (CC BY-NC), uploaded by Bob O'Kennon
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- 46. (c) Jason Sharp, some rights reserved (CC BY-NC-SA), uploaded by Jason Sharp
- 47. (c) Shihmei Barger 舒詩玫, some rights reserved (CC BY-NC-ND)
- 48. (c) Chuck Sexton, some rights reserved (CC BY-NC), uploaded by Chuck Sexton
- 49. (c) Richard Reynolds, some rights reserved (CC BY-NC), uploaded by Richard Reynolds
- 50. (c) Stephen Betzen, some rights reserved (CC BY-NC-SA), uploaded by Stephen Betzen
- 51. (c) Cindy Traxler, some rights reserved (CC BY-NC), uploaded by Cindy Traxler
- 52. (c) Kai Yan, Joseph Wong, some rights reserved (CC BY-NC-SA)
- 53. (c) Dolly, some rights reserved (CC BY-NC-SA), uploaded by Dolly
- 54. (c) Karsen Larue, some rights reserved (CC BY-NC), uploaded by Karsen Larue
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- 56. (c) amy_buthod, some rights reserved (CC BY-NC-SA)
- 57. (c) Steven Kurniawidjaja, some rights reserved (CC BY-NC), uploaded by Steven Kurniawidjaja
- 58. (c) Michael Gras, M.Ed., some rights reserved (CC BY), uploaded by Michael Gras, M.Ed.
- 59. (c) James Steamer, some rights reserved (CC BY-NC), uploaded by James Steamer
- 60. (c) Matt Webb, some rights reserved (CC BY-NC), uploaded by Matt Webb
- 61. (c) Jason Sharp, some rights reserved (CC BY-NC-SA)
- 62. (c) CameliaTWU, some rights reserved (CC BY-NC-SA)
- 63. (c) Hermann Falkner, some rights reserved (CC BY-NC)
- 64. (c) Albert, some rights reserved (CC BY-NC), uploaded by Albert
- 65. (c) wplynn, some rights reserved (CC BY-ND)
- 66. (c) Forest & Kim Starr, some rights reserved (CC BY)
- 67. (c) Dan Mullen, some rights reserved (CC BY-NC-ND)
- 68. (c) hayleec, some rights reserved (CC BY-NC)
- 69. (c) Grzegorz Grzejszczak, some rights reserved (CC BY-SA), uploaded by Grzegorz Grzejszczak
- 70. (c) mauroguanandi, some rights reserved (CC BY)
- 71. (c) Lindsey K. Wise, some rights reserved (CC BY), uploaded by Lindsey K. Wise
- 72. (c) Patrick Coin, some rights reserved (CC BY-NC-SA)
- 73. (c) Carol Jacobs-Carre, some rights reserved (CC BY-NC-ND)
- 74. (c) Salomé, some rights reserved (CC BY-NC-SA)
- 75. (c) Steven J. Baskauf, some rights reserved (CC BY)
- 76. (c) RASSIL, some rights reserved (CC BY-SA)
- 77. (c) Alex Abair, some rights reserved (CC BY-NC), uploaded by Alex Abair
- 78. (c) Chris Poling, some rights reserved (CC BY-NC), uploaded by Chris Poling
- 79. (c) Natalie Wilkinson, some rights reserved (CC BY-NC), uploaded by Natalie Wilkinson
- 80. (c) Henry Burrows, some rights reserved (CC BY-SA)
- 81. (c) Frank Mayfield, some rights reserved (CC BY-SA)
- 82. (c) DM, some rights reserved (CC BY-ND)
- 83. (c) Bob Romero, some rights reserved (CC BY-NC), uploaded by Bob Romero
- 84. (c) nancyed, some rights reserved (CC BY-NC-ND), uploaded by nancyed
- 85. (c) thesnaguy, some rights reserved (CC BY-NC-SA), uploaded by thesnaguy
- 86. (c) charley, some rights reserved (CC BY-NC), uploaded by charley
- 87. (c) Gregg Lee, some rights reserved (CC BY-NC-ND), uploaded by Gregg Lee
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- 89. (c) jerickson, some rights reserved (CC BY-NC), uploaded by jerickson
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- 91. (c) Ashley Morris, some rights reserved (CC BY-NC), uploaded by Ashley Morris
- 92. (c) Tim Guida, some rights reserved (CC BY-NC), uploaded by Tim Guida
- 93. (c) Marc Opperman, some rights reserved (CC BY)
- 94. (c) Michael D Fox, some rights reserved (CC BY), uploaded by Michael D Fox
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- 99. (c) Anita Gould, some rights reserved (CC BY-NC), uploaded by Anita Gould
- 100. (c) Bob Peterson, some rights reserved (CC BY-NC-SA)
- 101. (c) Bob Peterson, some rights reserved (CC BY-SA)
- 102. (c) dbarronoss, some rights reserved (CC BY-NC-ND)
- 103. no rights reserved, uploaded by Patrick Alexander
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- 107. (c) Erin Taylor, some rights reserved (CC BY-NC), uploaded by Erin Taylor
- 108. (c) Steven J. Baskauf, some rights reserved (CC BY-NC-SA)
- 109. (c) DavidR.808, some rights reserved (CC BY-NC), uploaded by DavidR.808
- 110. (c) Jason Sturner, some rights reserved (CC BY)
- 111. (c) Smithsonian Institution, National Museum of Natural History, Department of Botany, some rights reserved (CC BY-NC-SA)
- 112. (c) Vincent Scheidt, some rights reserved (CC BY-NC), uploaded by Vincent Scheidt
- 113. (c) José María Escolano, some rights reserved (CC BY-NC-SA)
- 114. (c) Stan Shebs, some rights reserved (CC BY-SA)
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- 117. (c) Sunny Fleming, some rights reserved (CC BY-NC), uploaded by Sunny Fleming
- 118. (c) Aaron Carlson, some rights reserved (CC BY), uploaded by Aaron Carlson
- 119. (c) Anthony, some rights reserved (CC BY-NC), uploaded by Anthony
- 120. (c) Lisa Brown, some rights reserved (CC BY-NC)
- 121. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
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- 128. (c) George F Mayfield, some rights reserved (CC BY-SA)
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- 132. (c) Susan Bury, some rights reserved (CC BY-NC), uploaded by Susan Bury
- 133. (c) Debra Halter, some rights reserved (CC BY-NC), uploaded by Debra Halter
- 134. (c) Anita, some rights reserved (CC BY-NC)
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- 139. (c) Steve Guttman, some rights reserved (CC BY-NC-ND)
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- 141. (c) Matthew Herron, some rights reserved (CC BY-NC), uploaded by Matthew Herron
- 142. (c) C. Mallory, some rights reserved (CC BY-NC), uploaded by C. Mallory
- 143. (c) Ryan McDaniel, some rights reserved (CC BY-NC), uploaded by Ryan McDaniel
- 144. (c) Nicholas Martinez, some rights reserved (CC BY-NC), uploaded by Nicholas Martinez
- 145. (c) Ben VanderWeide, some rights reserved (CC BY-NC), uploaded by Ben VanderWeide
- 146. (c) Erin Faulkner, some rights reserved (CC BY-NC), uploaded by Erin Faulkner
- 147. (c) Lauren Baur, some rights reserved (CC BY-NC-ND), uploaded by Lauren Baur
- 148. (c) Abigail Miller, some rights reserved (CC BY-NC), uploaded by Abigail Miller
- 149. (c) 106584015630019574849, some rights reserved (CC BY-NC-SA), uploaded by 106584015630019574849
- 150. (c) Flavio Rocchi, some rights reserved (CC BY-NC), uploaded by Flavio Rocchi
- 151. (c) Danny Barron, some rights reserved (CC BY-NC-ND)
- 152. (c) Jason Singhurst, some rights reserved (CC BY-NC), uploaded by Jason Singhurst
- 153. (c) Jim Varnum, some rights reserved (CC BY-NC), uploaded by Jim Varnum
- 154. (c) Matthias Barth, some rights reserved (CC BY-NC)
- 155. (c) Mike Fenoglio, some rights reserved (CC BY-NC), uploaded by Mike Fenoglio
- 156. (c) Dinesh Valke, some rights reserved (CC BY-NC-SA)
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- 158. (c) Erik Jørgensen, some rights reserved (CC BY-NC-SA)
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- 162. (c) troney, some rights reserved (CC BY-NC), uploaded by troney
- 163. (c) Eran Finkle, some rights reserved (CC BY)
- 164. (c) Mark Fishbein, some rights reserved (CC BY-NC), uploaded by Mark Fishbein
- 165. (c) Eréndira Canales, some rights reserved (CC BY-NC-SA), uploaded by Eréndira Canales
- 166. (c) J.R.M., some rights reserved (CC BY-NC-SA)
- 167. (c) 2013 Keir Morse, some rights reserved (CC BY-NC-SA)
- 168. (c) Mary Keim, some rights reserved (CC BY-NC-SA)
- 169. (c) CARLOS VELAZCO, some rights reserved (CC BY-NC), uploaded by CARLOS VELAZCO
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- 171. (c) CameliaTWU (off for a while), some rights reserved (CC BY-NC-ND)
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- 177. (c) Ron Marusak, some rights reserved (CC BY-NC), uploaded by Ron Marusak
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- 190. (c) Lee Elliott, some rights reserved (CC BY-NC-SA), uploaded by Lee Elliott
- 191. (c) Matthew O'Donnell, some rights reserved (CC BY-NC-SA), uploaded by Matthew O'Donnell
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- 207. (c) Mark Kluge, some rights reserved (CC BY-NC-ND), uploaded by Mark Kluge
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- 213. (c) Shihmei Barger 舒詩玫, some rights reserved (CC BY-NC-ND)
- 214. (c) Evan M. Raskin, some rights reserved (CC BY), uploaded by Evan M. Raskin
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- 219. (c) Conor McMahon, some rights reserved (CC BY-NC), uploaded by Conor McMahon
- 220. (c) Meghan Cassidy, some rights reserved (CC BY-SA), uploaded by Meghan Cassidy
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- 230. (c) Grahame, some rights reserved (CC BY-NC-ND), uploaded by Grahame
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- 236. (c) Leigh Anne McConnaughey, some rights reserved (CC BY-SA), uploaded by Leigh Anne McConnaughey
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- 239. (c) bbi2, some rights reserved (CC BY-NC), uploaded by bbi2
- 240. (c) Leonora Enking, some rights reserved (CC BY-SA)
- 241. (c) David Renoult, some rights reserved (CC BY-NC), uploaded by David Renoult
- 242. (c) Ted Bodner, Southern Weed Science Society / James H. Miller, USDA Forest Service, some rights reserved (CC BY)
- 243. (c) Ann WF, some rights reserved (CC BY-NC), uploaded by Ann WF
- 244. (c) amy_b, some rights reserved (CC BY-NC-SA)
- 245. (c) Pauline Singleton, some rights reserved (CC BY-NC), uploaded by Pauline Singleton
- 246. (c) JanetandPhil, some rights reserved (CC BY-NC-ND)
- 247. (c) Djlayton4, some rights reserved (CC BY-SA)
- 248. (c) Joshua Mayer, some rights reserved (CC BY-SA)
- 249. (c) lizroden, some rights reserved (CC BY-NC)
- 250. (c) Michael Ellis, some rights reserved (CC BY), uploaded by Michael Ellis
- 251. (c) Jack, some rights reserved (CC BY-NC), uploaded by Jack
- 252. (c) Tom Potterfield, some rights reserved (CC BY-NC-SA)
- 253. (c) Jesse Rorabaugh, some rights reserved (CC BY), uploaded by Jesse Rorabaugh
- 254. (c) Marcia Cirillo, some rights reserved (CC BY-NC)
- 255. (c) 101303066417393399106, some rights reserved (CC BY-NC)
- 256. (c) plerd, some rights reserved (CC BY)
- 257. (c) KENPEI, some rights reserved (CC BY-SA)
- 258. (c) Brent Franklin, some rights reserved (CC BY-NC), uploaded by Brent Franklin
- 259. (c) Kerry Wixted, some rights reserved (CC BY-NC)
- 260. (c) Nick Turland, some rights reserved (CC BY-NC-ND)
- 261. (c) m4duncan, some rights reserved (CC BY-NC)
- 262. (c) Alison, some rights reserved (CC BY-NC), uploaded by Alison
- 263. (c) Phillip Merritt, some rights reserved (CC BY-NC-SA)
- 264. (c) jacksonduub, some rights reserved (CC BY-NC)
- 265. (c) Tom Palmer, some rights reserved (CC BY-NC), uploaded by Tom Palmer
- 266. (c) José MarÃa Escolano, some rights reserved (CC BY-NC-SA)
- 267. (c) Dave, some rights reserved (CC BY-NC-SA)
- 268. (c) stonebird, some rights reserved (CC BY-NC-SA)
- 269. (c) Hilda Flamholtz, some rights reserved (CC BY-NC), uploaded by Hilda Flamholtz
- 270. (c) "USDA NRCS Wetland Science Institute.", some rights reserved (CC BY-NC-SA)
- 271. (c) Mike Leveille, some rights reserved (CC BY-NC), uploaded by Mike Leveille
- 272. (c) Melissa McMasters, some rights reserved (CC BY)
- 273. (c) jacki-dee ('retro look' option please), some rights reserved (CC BY-NC-ND)
- 274. (c) Scott Sauer, some rights reserved (CC BY-NC), uploaded by Scott Sauer
- 275. (c) aarongunnar, some rights reserved (CC BY), uploaded by aarongunnar
- 276. (c) Forest and Kim Starr, some rights reserved (CC BY)
- 277. (c) dakoalabear, some rights reserved (CC BY-NC)
- 278. (c) Todd Jackson, some rights reserved (CC BY-NC), uploaded by Todd Jackson
- 279. (c) tsc_wis, some rights reserved (CC BY-NC)
- 280. (c) tnewman, some rights reserved (CC BY-NC)
- 281. (c) John Hilty, some rights reserved (CC BY-NC)
- 282. (c) Damon Tighe, some rights reserved (CC BY-NC), uploaded by Damon Tighe
- 283. (c) Zihao Wang, some rights reserved (CC BY), uploaded by Zihao Wang
- 284. (c) hikingsandiego, some rights reserved (CC BY-NC), uploaded by hikingsandiego
- 285. (c) Ronnie Pitman, some rights reserved (CC BY-NC)
- 286. (c) Bill Dodd, some rights reserved (CC BY-NC)
- 287. (c) Robby Deans, some rights reserved (CC BY-NC), uploaded by Robby Deans
- 288. (c) Jacki Dougan, some rights reserved (CC BY-NC-ND)
- 289. (c) NC Orchid, some rights reserved (CC BY-NC)
- 290. (c) Diana-Terry Hibbitts, some rights reserved (CC BY-NC), uploaded by Diana-Terry Hibbitts
- 291. (c) Jenny Evans, some rights reserved (CC BY-NC)
- 292. (c) Larry Snyder, some rights reserved (CC BY-NC), uploaded by Larry Snyder
- 293. (c) Ken-ichi Ueda, some rights reserved (CC BY)
- 294. (c) JFKCom, some rights reserved (CC BY-SA)
- 295. (c) John B., some rights reserved (CC BY)
- 296. (c) Hannah Blumenfeld, some rights reserved (CC BY-SA), uploaded by Hannah Blumenfeld
- 297. (c) Marc Opperman, some rights reserved (CC BY-NC), uploaded by Marc Opperman
- 298. (c) Вікторія Тротнер(Приймачук), some rights reserved (CC BY-SA)
- 299. (c) Rob Curtis, some rights reserved (CC BY-NC-SA), uploaded by Rob Curtis
- 300. (c) Roberto R. Calderón, some rights reserved (CC BY-NC), uploaded by Roberto R. Calderón
- 301. (c) Reinaldo Aguilar, some rights reserved (CC BY-NC-SA)
- 302. (c) Anne Worner, some rights reserved (CC BY)
- 303. (c) Belinda Lo, some rights reserved (CC BY-NC-SA), uploaded by Belinda Lo
- 304. (c) Alberto Lozano, some rights reserved (CC BY-NC), uploaded by Alberto Lozano
- 305. (c) Gustavo Durán, some rights reserved (CC BY-NC-SA)
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