Poplars at the Lower Rhine (Photo: S. Schulte-Kellinghaus)
Flora at the Lower Rhine (Photo: S. Schulte-Kellinghaus)
Border of the Rhine (Photo: S. Schulte-Kellinghaus)
Animals
Canada goose (Photo: S. Schulte-Kellinghaus)
Black-headed gull (Photo: S. Schulte-Kellinghaus)
Asian clam (Photo: S. Schulte-Kellinghaus)
Schools and educational institutions may use all photos as didactic material. Their commercial use is only permitted upon agreement with the ICPR or authorization of the photographer.