Photos:
- 1. (c) Paul Asman and Jill Lenoble, some rights reserved (CC BY)
- 2. no rights reserved, uploaded by Kent McFarland
- 3. (c) Hermann Falkner, some rights reserved (CC BY-NC)
- 4. (c) Dane Larsen, some rights reserved (CC BY-NC)
- 5. (c) Greg Woodhouse, some rights reserved (CC BY-NC)
- 6. (c) Brent Miller, some rights reserved (CC BY-NC-ND)
- 7. (c) Dan Mullen, some rights reserved (CC BY-NC-ND)
- 8. (c) F. D. Richards, some rights reserved (CC BY-SA)
- 9. (c) Andrey Zharkikh, some rights reserved (CC BY)
- 10. (c) Susan, some rights reserved (CC BY-NC), uploaded by Susan
- 11. (c) Arthur Chapman, some rights reserved (CC BY-NC-SA)
- 12. (c) Matt Lavin, some rights reserved (CC BY-SA)
- 13. (c) Steve Chilton, some rights reserved (CC BY-NC-ND)
- 14. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 15. (c) Grant Thomas, some rights reserved (CC BY-NC), uploaded by Grant Thomas
- 16. (c) natureguy, some rights reserved (CC BY-NC-ND), uploaded by natureguy
- 17. (c) David Hofmann, some rights reserved (CC BY-NC-ND)
- 18. (c) weaselheadpark, some rights reserved (CC BY-NC), uploaded by weaselheadpark
- 19. (c) dgander, some rights reserved (CC BY-NC)
- 20. (c) Anapko, some rights reserved (CC BY-NC-SA)
- 21. (c) ashegan, some rights reserved (CC BY-NC), uploaded by ashegan
- 22. (c) Patrick Alexander, some rights reserved (CC BY-NC-ND)
- 23. (c) Tyler Christensen, some rights reserved (CC BY-NC), uploaded by Tyler Christensen
- 24. (c) J.R.M., some rights reserved (CC BY-NC-SA)
- 25. (c) Jenny Smith, some rights reserved (CC BY-NC), uploaded by Jenny Smith
- 26. (c) Hollis Marriott, some rights reserved (CC BY-NC), uploaded by Hollis Marriott
- 27. (c) Tim Waters, some rights reserved (CC BY-NC-ND)
- 28. (c) Sepehr Ehsani, some rights reserved (CC BY-NC-ND)
- 29. (c) Andreas Rockstein, some rights reserved (CC BY-SA)
- 30. (c) dbarronoss, some rights reserved (CC BY-NC-ND)
- 31. (c) Randi Hausken, some rights reserved (CC BY-NC)
- 32. (c) AnneTanne, some rights reserved (CC BY-NC-SA)
- 33. (c) C. Mallory, some rights reserved (CC BY-NC), uploaded by C. Mallory
- 34. (c) Erika Mitchell, some rights reserved (CC BY-NC), uploaded by Erika Mitchell
- 35. (c) Laurel F, some rights reserved (CC BY-SA)
- 36. (c) Carol Jacobs-Carre, some rights reserved (CC BY-NC-ND)
- 37. (c) Kingsbrae Garden, some rights reserved (CC BY-NC-SA)
- 38. (c) Donna, some rights reserved (CC BY-ND)
- 39. (c) chilko, some rights reserved (CC BY-NC)
- 40. (c) Miao Ling He, some rights reserved (CC BY-NC), uploaded by Miao Ling He
- 41. (c) 101595408250610106310, some rights reserved (CC BY), uploaded by 101595408250610106310
- 42. (c) takomabibelot, some rights reserved (CC BY)
- 43. (c) Bryant Olsen, some rights reserved (CC BY-NC)
- 44. (c) voss-lark, some rights reserved (CC BY-NC)
- 45. (c) Dan and Raymond, some rights reserved (CC BY-NC-SA)
- 46. (c) sea-kangaroo, some rights reserved (CC BY-NC-ND), uploaded by sea-kangaroo
- 47. (c) Tom Hilton, some rights reserved (CC BY)
- 48. (c) ellen hildebrandt, some rights reserved (CC BY-NC), uploaded by ellen hildebrandt
- 49. (c) Mark Fishbein, some rights reserved (CC BY-NC), uploaded by Mark Fishbein
- 50. (c) James Gaither, some rights reserved (CC BY-NC-ND)
- 51. (c) Alex Abair, some rights reserved (CC BY-NC), uploaded by Alex Abair
- 52. (c) Frank Mayfield, some rights reserved (CC BY-SA)
- 53. (c) Katja Schulz, some rights reserved (CC BY)
- 54. (c) Елена Шубницина, some rights reserved (CC BY-NC), uploaded by Елена Шубницина
- 55. (c) H.M. Hofling, some rights reserved (CC BY-NC), uploaded by H.M. Hofling
- 56. (c) Marshal Hedin, some rights reserved (CC BY)
- 57. (c) Ehoarn Bidault, some rights reserved (CC BY-NC), uploaded by Ehoarn Bidault
- 58. (c) Allison Del Gizzi, some rights reserved (CC BY-NC), uploaded by Allison Del Gizzi
- 59. (c) sfitzgerald86, some rights reserved (CC BY-NC), uploaded by sfitzgerald86
- 60. (c) 2006 James Morefield, some rights reserved (CC BY-NC-SA)
- 61. (c) Michael J. Oldham, some rights reserved (CC BY-NC), uploaded by Michael J. Oldham
- 62. (c) Vincent Scheidt, some rights reserved (CC BY-NC), uploaded by Vincent Scheidt
- 63. (c) Jurga Motiejūnaitė, some rights reserved (CC BY-NC), uploaded by Jurga Motiejūnaitė
- 64. (c) NY State IPM Program at Cornell University, some rights reserved (CC BY)
- 65. (c) Matt Lavin, some rights reserved (CC BY)
- 66. (c) easmith2, some rights reserved (CC BY-NC), uploaded by easmith2
- 67. (c) beautifulcataya, some rights reserved (CC BY-NC-ND)
- 68. (c) Jon Sullivan, some rights reserved (CC BY)
- 69. (c) Willie Angus, some rights reserved (CC BY-NC)
- 70. (c) Alwyn Ladell, some rights reserved (CC BY-NC-ND)
- 71. (c) Franz Xaver, some rights reserved (CC BY-SA)
- 72. (c) Dorota (Dorothy), some rights reserved (CC BY-SA)
- 73. (c) Соколков Юрий Павлович, some rights reserved (CC BY-NC), uploaded by Соколков Юрий Павлович
- 74. (c) Joshua Mayer, some rights reserved (CC BY-SA)
- 75. (c) José María Escolano, some rights reserved (CC BY-NC-SA)
- 76. (c) Kelly Kines Crawford, some rights reserved (CC BY-NC), uploaded by Kelly Kines Crawford
- 77. (c) Radio Tonreg, some rights reserved (CC BY)
- 78. (c) Carolannie--slow return, some rights reserved (CC BY-NC-ND)
- 79. (c) Steve Guttman, some rights reserved (CC BY-NC-ND)
- 80. (c) John B., some rights reserved (CC BY)
- 81. (c) Matthew Herron, some rights reserved (CC BY-NC), uploaded by Matthew Herron
- 82. (c) pandg, some rights reserved (CC BY-NC), uploaded by pandg
- 83. (c) J M, some rights reserved (CC BY-SA)
- 84. (c) Belinda Lo, some rights reserved (CC BY-NC-SA)
- 85. (c) Алексей Афонин, some rights reserved (CC BY-NC), uploaded by Алексей Афонин
- 86. (c) eknuth, some rights reserved (CC BY-NC), uploaded by eknuth
- 87. (c) Franco Folini, some rights reserved (CC BY)
- 88. (c) Gary Nored, some rights reserved (CC BY-NC)
- 89. (c) Chuck Sexton, some rights reserved (CC BY-NC), uploaded by Chuck Sexton
- 90. (c) David Bygott, some rights reserved (CC BY-NC-SA)
- 91. no rights reserved
- 92. (c) Nova, some rights reserved (CC BY-SA)
- 93. (c) Razzu Engen, some rights reserved (CC BY-NC-SA)
- 94. (c) 2001 California Academy of Sciences, some rights reserved (CC BY-NC-SA)
- 95. (c) Cullen Hanks, some rights reserved (CC BY-NC), uploaded by Cullen Hanks
- 96. (c) Tim Haynes, some rights reserved (CC BY-NC-ND)
- 97. (c) Richard Reynolds, some rights reserved (CC BY-NC), uploaded by Richard Reynolds
- 98. (c) J Brew, some rights reserved (CC BY-SA)
- 99. (c) Simon Kingston, some rights reserved (CC BY-NC), uploaded by Simon Kingston
- 100. (c) Tony Rodd, some rights reserved (CC BY-NC-SA)
- 101. (c) --Tico--, some rights reserved (CC BY-NC-ND)
- 102. (c) Rocky Mountain National Park, some rights reserved (CC BY-ND)
- 103. (c) Timm Richardson, some rights reserved (CC BY-NC), uploaded by Timm Richardson
- 104. (c) conniegrube, some rights reserved (CC BY-NC)
- 105. (c) Melissa Brown, some rights reserved (CC BY-NC), uploaded by Melissa Brown
- 106. (c) Erick Noe Tapia Banda, some rights reserved (CC BY-NC), uploaded by Erick Noe Tapia Banda
- 107. (c) John, some rights reserved (CC BY-NC)
- 108. (c) lycurgust, some rights reserved (CC BY-NC)
- 109. (c) randomtruth, some rights reserved (CC BY-NC-SA)
- 110. (c) Debara, some rights reserved (CC BY-NC), uploaded by Debara
- 111. (c) Peter Prehn, some rights reserved (CC BY-NC-ND)
- 112. (c) wingedchimera, some rights reserved (CC BY-NC), uploaded by wingedchimera
- 113. (c) Lena Zappia, some rights reserved (CC BY-NC), uploaded by Lena Zappia
- 114. (c) Mark Kluge, some rights reserved (CC BY-NC-ND), uploaded by Mark Kluge
- 115. (c) Samuel Brinker, some rights reserved (CC BY-NC), uploaded by Samuel Brinker
- 116. (c) Damon Tighe, some rights reserved (CC BY-NC), uploaded by Damon Tighe
- 117. (c) Don Loarie, some rights reserved (CC BY)
- 118. (c) CW Riggs, some rights reserved (CC BY-NC), uploaded by CW Riggs
- 119. (c) Carolannie---eyewitness, some rights reserved (CC BY-NC-ND)
- 120. (c) Zack Harris, some rights reserved (CC BY-NC), uploaded by Zack Harris
- 121. (c) Jorunn D. Newth, some rights reserved (CC BY-NC-SA)
- 122. (c) Rick Williams, some rights reserved (CC BY-NC), uploaded by Rick Williams
- 123. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
- 124. (c) Hovenweep National Monument, some rights reserved (CC BY)
- 125. (c) Radio Tonreg, some rights reserved (CC BY)
- 126. (c) Fritzflohrreynolds, some rights reserved (CC BY-SA)
- 127. (c) Bryan Hamilton, some rights reserved (CC BY-NC), uploaded by Bryan Hamilton
- 128. (c) JanetandPhil, some rights reserved (CC BY-NC-ND)
- 129. (c) Tom Hilton, some rights reserved (CC BY), uploaded by Tom Hilton
- 130. (c) Brent Franklin, some rights reserved (CC BY-NC), uploaded by Brent Franklin
- 131. (c) Mia Johnson, some rights reserved (CC BY-NC), uploaded by Mia Johnson
- 132. (c) Bryan, some rights reserved (CC BY-NC), uploaded by Bryan
- 133. (c) 57Andrew, some rights reserved (CC BY-NC-ND)
- 134. (c) 2010 Barry Breckling, some rights reserved (CC BY-NC-SA)
- 135. (c) Todd Ramsden, some rights reserved (CC BY-NC), uploaded by Todd Ramsden
- 136. (c) Andy, some rights reserved (CC BY-NC-ND)
- 137. (c) Sten Porse, some rights reserved (CC BY-SA)
- 138. (c) 1998 California Academy of Sciences, some rights reserved (CC BY-NC-SA)
- 139. (c) JerryFriedman, some rights reserved (CC BY-SA)
- 140. Steven Olson, no known copyright restrictions (public domain)
- 141. (c) Jason Whittle, some rights reserved (CC BY-NC-ND), uploaded by Jason Whittle
- 142. (c) Nick Beck, some rights reserved (CC BY-NC-SA)
- 143. (c) Anna Evans, some rights reserved (CC BY-NC), uploaded by Anna Evans
- 144. (c) Seth Hendriks, some rights reserved (CC BY-NC), uploaded by Seth Hendriks
- 145. (c) jacki-dee ('retro look' option please), some rights reserved (CC BY-NC-ND)
- 146. (c) Tom Potterfield, some rights reserved (CC BY-NC-SA)
- 147. (c) Michael, some rights reserved (CC BY-NC)
- 148. (c) Jason Hollinger, some rights reserved (CC BY)
- 149. (c) licensed media from USDA PLANTS images without owner, some rights reserved (CC BY-NC-SA)
- 150. (c) Bas Kers, some rights reserved (CC BY-NC-SA)
- 151. (c) Don Sutherland, some rights reserved (CC BY-NC), uploaded by Don Sutherland
- 152. (c) Andy Newman, some rights reserved (CC BY-NC), uploaded by Andy Newman
- 153. (c) Biopix, some rights reserved (CC BY-NC)
- 154. (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick
- 155. (c) botanybee, some rights reserved (CC BY-NC)
- 156. (c) kbeeley, some rights reserved (CC BY-NC), uploaded by kbeeley
- 157. (c) Joe Decruyenaere, some rights reserved (CC BY-SA)
- 158. (c) Charlie Hohn, some rights reserved (CC BY), uploaded by Charlie Hohn
- 159. (c) Louis, some rights reserved (CC BY-SA)
- 160. (c) Ranger InDa Trees, some rights reserved (CC BY-NC-ND), uploaded by Ranger InDa Trees
- 161. (c) Stefan.lefnaer, some rights reserved (CC BY-SA)
- 162. (c) Rodrigo Sala, some rights reserved (CC BY-ND)
- 163. (c) Anita, some rights reserved (CC BY-NC)
- 164. (c) earl woolsey, some rights reserved (CC BY-NC-SA), uploaded by earl woolsey
- 165. (c) Jason Sturner, some rights reserved (CC BY)
- 166. (c) Belinda Lo, some rights reserved (CC BY-NC-SA), uploaded by Belinda Lo
- 167. (c) Mary Krieger, some rights reserved (CC BY), uploaded by Mary Krieger
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