Photos:
- 1. (c) Chris Brown, some rights reserved (CC BY-NC), uploaded by Chris Brown
- 2. (c) Paul Norwood, some rights reserved (CC BY-NC), uploaded by Paul Norwood
- 3. (c) M. Goff, some rights reserved (CC BY-NC-SA), uploaded by M. Goff
- 4. (c) Julien Renoult, some rights reserved (CC BY), uploaded by Julien Renoult
- 5. (c) batwrangler, some rights reserved (CC BY-NC-ND)
- 6. (c) National Museums Northern Ireland and its licensors, some rights reserved (CC BY-NC-SA)
- 7. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal
- 8. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
- 9. (c) NOAA Photo Library, some rights reserved (CC BY)
- 10. (c) Robert de Bruijn, some rights reserved (CC BY-NC-ND)
- 11. (c) gailhampshire, some rights reserved (CC BY)
- 12. (c) Blake Matheson, some rights reserved (CC BY-NC)
- 13. (c) Yathin, some rights reserved (CC BY-NC-ND)
- 14. (c) kristenk, some rights reserved (CC BY-NC), uploaded by kristenk
- 15. (c) Mark Ahlness, some rights reserved (CC BY-NC-ND)
- 16. (c) Marshal Hedin, some rights reserved (CC BY-NC-SA)
- 17. (c) Martha de Jong-Lantink, some rights reserved (CC BY-NC-ND)
- 18. (c) BIO Photography Group, Biodiversity Institute of Ontario, some rights reserved (CC BY-NC-SA)
- 19. (c) marlin harms, some rights reserved (CC BY)
- 20. (c) Jerry Kirkhart, some rights reserved (CC BY)
- 21. (c) Dan Hershman, some rights reserved (CC BY-NC-SA)
- 22. (c) brewbooks, some rights reserved (CC BY-SA)
- 23. (c) Erik Hannon, some rights reserved (CC BY)
- 24. (c) Ken-ichi Ueda, some rights reserved (CC BY)
- 25. (c) sneha, some rights reserved (CC BY-NC)
- 26. (c) anonymous, some rights reserved (CC BY-SA)
- 27. (c) CAFS, some rights reserved (CC BY-NC)
- 28. (c) Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes, some rights reserved (CC BY-NC-SA)
- 29. (c) Travis, some rights reserved (CC BY-NC)
- 30. (c) Sarka Martinez, some rights reserved (CC BY-NC-SA), uploaded by Sarka Martinez
- 31. (c) ianredan, some rights reserved (CC BY-NC)
- 32. (c) Don Loarie, some rights reserved (CC BY)
- 33. (c) Ocean Networks Canada, some rights reserved (CC BY-NC-SA)
- 34. (c) EcologyWA, some rights reserved (CC BY-NC)
- 35. (c) catchang, some rights reserved (CC BY-NC), uploaded by catchang
- 36. (c) akinisbet, some rights reserved (CC BY-NC)
- 37. (c) Femorale, some rights reserved (CC BY-NC)
- 38. (c) Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology, some rights reserved (CC BY-NC-SA)
- 39. (c) Alison Young, some rights reserved (CC BY-NC), uploaded by Alison Young
- 40. (c) Sarka Martinez, some rights reserved (CC BY-NC), uploaded by Sarka Martinez
- 41. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
- 42. (c) cassidy, some rights reserved (CC BY-NC), uploaded by cassidy
- 43. (c) Dan Hershman, some rights reserved (CC BY)
- 44. (c) Massimiliano De Martino, some rights reserved (CC BY)
- 45. (c) lhillmann, some rights reserved (CC BY-NC)
- 46. (c) matt knoth, some rights reserved (CC BY-NC-ND)
- 47. (c) Georgina Jones, some rights reserved (CC BY-SA), uploaded by Georgina Jones
- 48. (c) Ken-ichi Ueda, some rights reserved (CC BY-NC-SA)
- 49. (c) Robin Agarwal (ANudibranchMom on iNaturalist), some rights reserved (CC BY-NC)
- 50. (c) amy lemur, some rights reserved (CC BY-NC-ND)
- 51. (c) Minette Layne, some rights reserved (CC BY)
- 52. (c) 2005 California Academy of Sciences, some rights reserved (CC BY-NC-SA)
- 53. (c) J. Maughn, some rights reserved (CC BY-NC)
- 54. (c) Di, some rights reserved (CC BY-NC), uploaded by Di
- 55. (c) Erin McKittrick, some rights reserved (CC BY), uploaded by Erin McKittrick
- 56. (c) Sarah Chinn, some rights reserved (CC BY-NC), uploaded by Sarah Chinn
- 57. (c) Wendy Feltham, all rights reserved, uploaded by Wendy Feltham
- 58. (c) Images by John 'K', some rights reserved (CC BY-NC-ND)
- 59. (c) Matt Knoth, some rights reserved (CC BY)
- 60. (c) Zach Hawn, some rights reserved (CC BY-NC-SA)
- 61. (c) canopic, some rights reserved (CC BY-NC-ND)
- 62. (c) rkcampbell, some rights reserved (CC BY-NC)
- 63. (c) Kim, Hyun-tae, some rights reserved (CC BY), uploaded by Kim, Hyun-tae
- 64. (c) dlbowls, some rights reserved (CC BY-NC), uploaded by dlbowls
- 65. (c) Liam O'Brien, some rights reserved (CC BY-NC), uploaded by Liam O'Brien
- 66. (c) Rebecca Johnson, some rights reserved (CC BY-NC), uploaded by Rebecca Johnson
- 67. (c) kathawk, some rights reserved (CC BY-NC), uploaded by kathawk
- 68. (c) Thesupermat, some rights reserved (CC BY-SA)
- 69. (c) tsoleau, some rights reserved (CC BY-NC-ND)
- 70. (c) Emőke Dénes, some rights reserved (CC BY-SA)
- 71. (c) Matthew O'Donnell, some rights reserved (CC BY-NC-SA), uploaded by Matthew O'Donnell
- 72. (c) Rebecca, some rights reserved (CC BY-NC), uploaded by Rebecca
- 73. (c) Eric Running, some rights reserved (CC BY-NC), uploaded by Eric Running
- 74. (c) VIUDeepBay, some rights reserved (CC BY)
- 75. (c) ekelley128, some rights reserved (CC BY-NC)
- 76. (c) hj_west, some rights reserved (CC BY-SA)
- 77. (c) Peter D. Tillman, some rights reserved (CC BY-SA)
- 78. (c) Susannah Anderson, some rights reserved (CC BY-NC-ND)
- 79. (c) aaronbaldwin, some rights reserved (CC BY-NC), uploaded by aaronbaldwin
- 80. (c) Don Loarie, some rights reserved (CC BY-NC-SA)
- 81. (c) Vivitaycoleand0, some rights reserved (CC BY-NC-ND)
- 82. (c) Ingrid Taylar, some rights reserved (CC BY)
- 83. no rights reserved
- 84. (c) 1999 California Academy of Sciences, some rights reserved (CC BY-NC-SA)
- 85. (c) Bill Rodstrom, some rights reserved (CC BY-NC), uploaded by Bill Rodstrom
- 86. (c) Brenna Green, some rights reserved (CC BY-NC-ND), uploaded by Brenna Green
- 87. (c) Even Dankowicz, some rights reserved (CC BY), uploaded by Even Dankowicz
- 88. (c) Joshua Tewksbury, some rights reserved (CC BY-NC-SA), uploaded by Joshua Tewksbury
- 89. (c) Lynette Schimming, some rights reserved (CC BY-NC-SA)
- 90. (c) Luke McGuff, some rights reserved (CC BY-ND)
- 91. (c) esayre, some rights reserved (CC BY-NC)
- 92. (c) Minette Layne, some rights reserved (CC BY-SA)
- 93. (c) Richard Droker, some rights reserved (CC BY-NC-ND)
- 94. (c) Stephen Bentsen, some rights reserved (CC BY-NC-ND)
- 95. (c) Damon Tighe, some rights reserved (CC BY-NC)
- 96. (c) Rhiannon Boyle, some rights reserved (CC BY-NC-ND)
- 97. (c) Brian Honohan, some rights reserved (CC BY-NC-SA)
- 98. (c) by and by, some rights reserved (CC BY-ND)
- 99. (c) Keith Daly, some rights reserved (CC BY-NC-SA)
- 100. (c) Minette Layne, some rights reserved (CC BY-NC)
- 101. (c) BJ Stacey, some rights reserved (CC BY-NC), uploaded by BJ Stacey
- 102. (c) cyric, some rights reserved (CC BY-NC-SA), uploaded by cyric
- 103. (c) Steven Pavlov, some rights reserved (CC BY-SA)
- 104. (c) Jay Wilson, some rights reserved (CC BY-NC-SA)
- 105. (c) airglow, some rights reserved (CC BY-NC), uploaded by airglow
- 106. (c) Chris Cook, some rights reserved (CC BY-NC), uploaded by Chris Cook
- 107. (c) WoRMS for SMEBD, some rights reserved (CC BY-NC-SA)
- 108. (c) Lorri Gong, some rights reserved (CC BY-NC-ND), uploaded by Lorri Gong
- 109. (c) Alfonso Herrera Bachiller, some rights reserved (CC BY-NC-SA)
- 110. (c) Ed Bierman, some rights reserved (CC BY)
- 111. (c) Kristian Peters, some rights reserved (CC BY-NC-SA)
- 112. (c) Jon Sullivan, some rights reserved (CC BY)
- 113. (c) Brianne Nelson, some rights reserved (CC BY-NC), uploaded by Brianne Nelson
- 114. (c) Susan J. Hewitt, some rights reserved (CC BY-NC), uploaded by Susan J. Hewitt
- 115. (c) lesismore, some rights reserved (CC BY-NC), uploaded by lesismore
- 116. (c) Ken-ichi Ueda, some rights reserved (CC BY-NC)
- 117. (c) holdfast..., some rights reserved (CC BY)
- 118. (c) anyoung78, some rights reserved (CC BY-NC), uploaded by anyoung78
- 119. (c) tyrelfroese, some rights reserved (CC BY-NC), uploaded by tyrelfroese
- 120. (c) Daniel Hershman from Federal Way, US, some rights reserved (CC BY)
- 121. (c) Gena Bentall, some rights reserved (CC BY-NC), uploaded by Gena Bentall
- 122. (c) james_holkko, some rights reserved (CC BY-NC)
- 123. (c) faerthen, some rights reserved (CC BY-NC), uploaded by faerthen
- 124. no rights reserved, uploaded by Scott Loarie
- 125. (c) kqedquest, some rights reserved (CC BY-NC)
- 126. (c) hikingsandiego, some rights reserved (CC BY-NC), uploaded by hikingsandiego
- 127. (c) 101595408250610106310, some rights reserved (CC BY), uploaded by 101595408250610106310
- 128. (c) Andrew Simon, some rights reserved (CC BY-NC), uploaded by Andrew Simon
- 129. (c) sykospark, some rights reserved (CC BY-NC), uploaded by sykospark
- 130. (c) kilasiak, some rights reserved (CC BY-NC), uploaded by kilasiak
- 131. (c) tangatawhenua, some rights reserved (CC BY-NC), uploaded by tangatawhenua
- 132. (c) Shona Treanor, some rights reserved (CC BY-NC), uploaded by Shona Treanor
- 133. (c) Brenna Green, some rights reserved (CC BY-NC-SA), uploaded by Brenna Green
- 134. (c) Ingrid P. Lin, some rights reserved (CC BY-NC-SA)
- 135. (c) jengordon, some rights reserved (CC BY-NC), uploaded by jengordon
- 136. (c) dickeyk, some rights reserved (CC BY)
- 137. (c) Cwmhiraeth, some rights reserved (CC BY-SA)
- 138. (c) Gary W. Saunders, University of New Brunswick, some rights reserved (CC BY-NC-SA)
- 139. (c) Bill Bouton, some rights reserved (CC BY-SA)
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