Edited by Alex Lamoreaux, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Ty Smith, some rights reserved (CC BY-NC), uploaded by Ty Smith
- 2. (c) Ryan Zucker, some rights reserved (CC BY-NC), uploaded by Ryan Zucker
- 3. (c) Sue Wetmore, some rights reserved (CC BY-NC), uploaded by Sue Wetmore
- 4. (c) caiawatha, some rights reserved (CC BY-NC), uploaded by caiawatha
- 5. (c) jmarcinik, some rights reserved (CC BY-NC), uploaded by jmarcinik
- 6. (c) Matt Muir, some rights reserved (CC BY), uploaded by Matt Muir
- 7. no rights reserved, uploaded by Braden J. Judson
- 8. (c) Jean-Sébastien Chartier-Dumais, some rights reserved (CC BY-NC-SA), uploaded by Jean-Sébastien Chartier-Dumais
- 9. (c) Chris Bentley, some rights reserved (CC BY-NC), uploaded by Chris Bentley
- 10. (c) Paul Jacyk, some rights reserved (CC BY-NC), uploaded by Paul Jacyk
- 11. (c) Christian Schwarz, some rights reserved (CC BY-NC), uploaded by Christian Schwarz
- 12. (c) Jerry Cannon, some rights reserved (CC BY-NC), uploaded by Jerry Cannon
- 13. (c) Rich Hoyer, some rights reserved (CC BY-NC-SA), uploaded by Rich Hoyer
- 14. (c) Samuel Brinker, some rights reserved (CC BY-NC), uploaded by Samuel Brinker
- 15. (c) johnmeikle, some rights reserved (CC BY-NC), uploaded by johnmeikle
- 16. (c) mikaelsoderberg, some rights reserved (CC BY)
- 17. (c) Bering Land Bridge National Preserve, some rights reserved (CC BY)
- 18. (c) Cristina, some rights reserved (CC BY-NC), uploaded by Cristina
- 19. (c) Gonzalo Mucientes Sandoval, some rights reserved (CC BY-NC-SA), uploaded by Gonzalo Mucientes Sandoval
- 20. (c) guyincognito, some rights reserved (CC BY-NC), uploaded by guyincognito
- 21. (c) Sergio Martínez, some rights reserved (CC BY-NC), uploaded by Sergio Martínez
- 22. (c) Nigel Marsh, some rights reserved (CC BY-NC), uploaded by Nigel Marsh
- 23. (c) Artie Kopelman, some rights reserved (CC BY-NC-ND)
- 24. (c) Luis P. B., some rights reserved (CC BY-NC), uploaded by Luis P. B.
- 25. (c) Ecomare/Salko de Wolf, some rights reserved (CC BY-SA)
- 26. (c) kliewer, some rights reserved (CC BY-NC), uploaded by kliewer
- 27. (c) Fundación Caja Mediterráneo, some rights reserved (CC BY-NC-ND)
- 28. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal
- 29. (c) Kingfisher, some rights reserved (CC BY-SA)
- 30. (c) Анна Голубева, some rights reserved (CC BY-NC-ND), uploaded by Анна Голубева
- 31. (c) Andrew Reding, some rights reserved (CC BY-NC-ND)
- 32. (c) C Yasuda, some rights reserved (CC BY-NC), uploaded by C Yasuda
- 33. (c) Vyacheslav Luzanov, some rights reserved (CC BY-NC), uploaded by Vyacheslav Luzanov
- 34. (c) Gregoire Dubois, some rights reserved (CC BY-NC), uploaded by Gregoire Dubois
- 35. (c) Frixo Lab, some rights reserved (CC BY-NC), uploaded by Frixo Lab
- 36. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
- 37. (c) peterkennerley, some rights reserved (CC BY-NC)
- 38. (c) Jon Nelson, some rights reserved (CC BY-NC-SA)
- 39. (c) Marshal Hedin, some rights reserved (CC BY-SA)
- 40. (c) Cameron Eckert, some rights reserved (CC BY-NC), uploaded by Cameron Eckert
- 41. (c) Josh More, some rights reserved (CC BY-NC-ND)
- 42. (c) Stephen DeHart, some rights reserved (CC BY-NC), uploaded by Stephen DeHart
- 43. (c) jefferykarafa, some rights reserved (CC BY-NC), uploaded by jefferykarafa
- 44. (c) Sylvie Fee Matter, some rights reserved (CC BY-NC)
- 45. (c) Alexander Yakovlev, some rights reserved (CC BY-NC), uploaded by Alexander Yakovlev
- 46. (c) Aleksandr Popov / Александр Попов, some rights reserved (CC BY-NC), uploaded by Aleksandr Popov / Александр Попов
- 47. (c) Neptune Canada, some rights reserved (CC BY-NC-SA)
- 48. (c) Riccardo Novaga, some rights reserved (CC BY-NC), uploaded by Riccardo Novaga
- 49. (c) Cameron, some rights reserved (CC BY-NC), uploaded by Cameron
- 50. (c) Alaska Region U.S. Fish & Wildlife Service, some rights reserved (CC BY-NC-ND)
- 51. (c) Ernest Keeley, some rights reserved (CC BY-NC), uploaded by Ernest Keeley
- 52. (c) Christa Rohrbach, some rights reserved (CC BY-NC-SA)
- 53. (c) Bruce Deagle, some rights reserved (CC BY), uploaded by Bruce Deagle
- 54. (c) Martin Grimm, some rights reserved (CC BY-NC), uploaded by Martin Grimm
- 55. (c) neilhusher, some rights reserved (CC BY-NC)
- 56. (c) Denis Doucet, some rights reserved (CC BY-NC), uploaded by Denis Doucet
- 57. (c) Bill Bouton, some rights reserved (CC BY-NC-SA)
- 58. (c) Carrie Seltzer, some rights reserved (CC BY-NC), uploaded by Carrie Seltzer
- 59. (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block
- 60. (c) Gordon Karre, some rights reserved (CC BY-NC), uploaded by Gordon Karre
- 61. (c) Pluvialis, some rights reserved (CC BY-NC), uploaded by Pluvialis
- 62. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 63. (c) Pavel Gorbunov, some rights reserved (CC BY-NC), uploaded by Pavel Gorbunov
- 64. (c) Paul Bedell, some rights reserved (CC BY-NC-SA)
- 65. (c) Susan Elliott, some rights reserved (CC BY-NC), uploaded by Susan Elliott
- 66. (c) Paul Prappas, some rights reserved (CC BY-NC), uploaded by Paul Prappas
- 67. (c) Jukka Jantunen, some rights reserved (CC BY-NC), uploaded by Jukka Jantunen
- 68. (c) Jim P. Brock, some rights reserved (CC BY-NC-SA)
- 69. (c) Stephen Cresswell, some rights reserved (CC BY-NC-ND), uploaded by Stephen Cresswell
- 70. no rights reserved, uploaded by Kent McFarland
- 71. (c) Josh Vandermeulen, some rights reserved (CC BY-NC-ND), uploaded by Josh Vandermeulen
- 72. (c) Mark Rosenstein, some rights reserved (CC BY-NC), uploaded by Mark Rosenstein
- 73. (c) Ken Kertell, some rights reserved (CC BY-NC), uploaded by Ken Kertell
- 74. (c) blcomegys, some rights reserved (CC BY-NC), uploaded by blcomegys
- 75. (c) Laura Gaudette, some rights reserved (CC BY), uploaded by Laura Gaudette
- 76. (c) upupamartin, some rights reserved (CC BY-NC-ND), uploaded by upupamartin
- 77. (c) Chris van Swaay, some rights reserved (CC BY-NC), uploaded by Chris van Swaay
- 78. (c) Tim Guida, some rights reserved (CC BY-NC), uploaded by Tim Guida
- 79. (c) Walter Siegmund, some rights reserved (CC BY-SA)
- 80. (c) Ed Hass, some rights reserved (CC BY-NC-ND), uploaded by Ed Hass
- 81. (c) Don Sutherland, some rights reserved (CC BY-NC), uploaded by Don Sutherland
- 82. (c) Samantha Leigh, some rights reserved (CC BY-NC), uploaded by Samantha Leigh
- 83. (c) Bryan Smith, some rights reserved (CC BY-NC), uploaded by Bryan Smith
- 84. (c) Leslie Flint, some rights reserved (CC BY-NC), uploaded by Leslie Flint