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- 1. (c) romanvrbicek, some rights reserved (CC BY-NC), uploaded by romanvrbicek
- 2. (c) César Favacho, some rights reserved (CC BY-NC), uploaded by César Favacho
- 3. (c) Yu Ching Tam, some rights reserved (CC BY-NC-ND), uploaded by Yu Ching Tam
- 4. (c) Tatyana Akulova, some rights reserved (CC BY-NC), uploaded by Tatyana Akulova
- 5. (c) User:Dawson at the English Wikipedia, some rights reserved (CC BY-SA)
- 6. (c) Natural England, some rights reserved (CC BY-NC-ND)
- 7. (c) Nina Sadykova, some rights reserved (CC BY-NC), uploaded by Nina Sadykova
- 8. (c) Sergey Yeliseev, some rights reserved (CC BY-NC-ND)
- 9. (c) 科学出版社, some rights reserved (CC BY-NC-SA)
- 10. (c) Christoph Moning, some rights reserved (CC BY), uploaded by Christoph Moning
- 11. (c) Bird Explorers, some rights reserved (CC BY-NC), uploaded by Bird Explorers
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- 13. (c) Christian Schwarz, some rights reserved (CC BY-NC), uploaded by Christian Schwarz
- 14. (c) Rich Hoyer, some rights reserved (CC BY-NC-SA), uploaded by Rich Hoyer
