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61. Der Purpurrote Martin (Hirundo purpurea). 62. Die Uferschwalbe (Hi...
Public domain scan of 19th-century zoological illustration, free to use, no copyright restrictions image
Cotyle Riparia. Sand-Martin.
Public domain scan of print / book page depicting birds, ornithology, free to use, no copyright restrictions image - Picryl description
Cotyle Riparia. Sand-Martin, jung.
Picryl description: Public domain image of a bird in flight, free to use, no copyright restrictions.