Edited by Mike Jackson, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Michael Webber, some rights reserved (CC BY-NC-SA)
- 2. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
- 3. (c) Christopher Michel, some rights reserved (CC BY)
- 4. (c) Kingfisher, some rights reserved (CC BY-SA)
- 5. (c) Nick Tepper, some rights reserved (CC BY-NC), uploaded by Nick Tepper
- 6. (c) jasondain, some rights reserved (CC BY-NC), uploaded by jasondain
- 7. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal
- 8. (c) noahgaines, some rights reserved (CC BY-NC), uploaded by noahgaines
- 9. (c) Charles Young, some rights reserved (CC BY-NC-ND)
- 10. (c) Owen Strickland, some rights reserved (CC BY-NC), uploaded by Owen Strickland
- 11. (c) Bering Land Bridge National Preserve, some rights reserved (CC BY)
- 12. (c) Yersinia pestis, some rights reserved (CC BY-NC-SA)
- 13. (c) Paul Cools, some rights reserved (CC BY-NC), uploaded by Paul Cools
- 14. (c) Jukka Jantunen, some rights reserved (CC BY-NC), uploaded by Jukka Jantunen
- 15. (c) Matt, some rights reserved (CC BY-NC-SA)
- 16. (c) Don McCullough, some rights reserved (CC BY-NC)
- 17. (c) pike JO, some rights reserved (CC BY)
- 18. (c) Örvar Atli Þorgeirsson, some rights reserved (CC BY-NC-ND)
- 19. (c) pfaucher, some rights reserved (CC BY-NC), uploaded by pfaucher
- 20. (c) joecf, some rights reserved (CC BY-NC-ND), uploaded by joecf
- 21. (c) Jason Burrows, some rights reserved (CC BY-NC-ND)
- 22. (c) Dan Weaver, some rights reserved (CC BY-NC)
- 23. (c) Allan Hopkins, some rights reserved (CC BY-NC-ND)
- 24. (c) François Xavier TESTU, some rights reserved (CC BY-NC-SA)
- 25. (c) Martha de Jong-Lantink, some rights reserved (CC BY-NC-ND)
