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- 1. (c) Owen Clarkin, some rights reserved (CC BY-NC), uploaded by Owen Clarkin
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- 9. (c) Tom Palmer, some rights reserved (CC BY-NC), uploaded by Tom Palmer
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- 26. (c) TreesOfTheWorld.net, some rights reserved (CC BY-NC-SA)
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- 28. (c) copepodo, some rights reserved (CC BY-NC-ND)
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- 30. (c) Alicia Pimental, some rights reserved (CC BY)
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- 32. (c) Alex Melman, some rights reserved (CC BY-NC-SA)
- 33. (c) Shihmei Barger 舒詩玫, some rights reserved (CC BY-NC-ND)