Edited by davidisham, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Michael Webber, some rights reserved (CC BY-NC-SA)
- 2. (c) Andrew Reding, some rights reserved (CC BY-NC-ND)
- 3. (c) Dan Dzurisin, some rights reserved (CC BY-NC-ND)
- 4. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 5. (c) Josh More, some rights reserved (CC BY-NC-ND)
- 6. (c) Bering Land Bridge National Preserve, some rights reserved (CC BY)
- 7. (c) davidcooksy, some rights reserved (CC BY-NC)
- 8. (c) Yersinia pestis, some rights reserved (CC BY-NC-SA)
- 9. (c) Dan Dzurisin, some rights reserved (CC BY)
- 10. (c) Carlos Ramirez Aldrete, some rights reserved (CC BY-NC), uploaded by Carlos Ramirez Aldrete
- 11. (c) Elizabeth Haslam, some rights reserved (CC BY-NC)
- 12. (c) Phil Warren, some rights reserved (CC BY-NC), uploaded by Phil Warren
- 13. (c) Matt, some rights reserved (CC BY-NC-SA)
- 14. (c) pike JO, some rights reserved (CC BY)
- 15. (c) bobbyvalero, some rights reserved (CC BY-NC), uploaded by bobbyvalero
- 16. (c) pfaucher, some rights reserved (CC BY-NC), uploaded by pfaucher
- 17. (c) Robin Gwen Agarwal, some rights reserved (CC BY-NC), uploaded by Robin Gwen Agarwal