Edited by María Begoña García, Manuel, and Ane Mujika, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Maja Dumat, some rights reserved (CC BY)
- 2. (c) Oskar Gran, some rights reserved (CC BY-NC)
- 3. (c) Keith W. Larson, some rights reserved (CC BY-NC), uploaded by Keith W. Larson
- 4. (c) Muriel Bendel, some rights reserved (CC BY-NC), uploaded by Muriel Bendel
