Edited by Renata Leite Pitman, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Wolfgang Siebeneich, some rights reserved (CC BY-NC), uploaded by Wolfgang Siebeneich
- 2. (c) Mark Kluge, some rights reserved (CC BY-NC-ND), uploaded by Mark Kluge
- 3. (c) Steven Severinghaus, some rights reserved (CC BY-NC-SA)
- 4. (c) Sara Rall, some rights reserved (CC BY-NC), uploaded by Sara Rall
