Edited by Paul Braun, some rights reserved (CC BY-SA)
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- 5. (c) fra298 [more often off than on], some rights reserved (CC BY-NC-ND)
- 6. (c) House_Sparrow_(Passer_domesticus)-_Female_in_Kolkata_I_IMG_3787.jpg, some rights reserved (CC BY-SA)
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- 8. (c) Kari Pihlaviita, some rights reserved (CC BY-NC)
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Didier Descouens, some rights reserved (CC BY-SA)
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