Klaus Cerjak:
Chroicocephalus maculipennis / Patagonia, Argentina
Klaus Cerjak:
Larus dominicanus / Patagonia, Argentina
Klaus Cerjak:
Larus dominicanus, Eubalaena australis / Patagonia, Argentina
Klaus Cerjak:
Larus cachinnans / Drau, Austria
Klaus Cerjak:
Chroicocephalus ridibundus / Traunsee, Austria
Klaus Cerjak:
Larus canus / Traunsee, Austria
Klaus Cerjak:
Hydrocoloeus minutus / Drau, Austria
Klaus Cerjak:
Larus michahellis / Split, Croatia
Klaus Cerjak:
Larus michahellis / Venice, Italy
Klaus Cerjak:
Larus michahellis / Corsica, France
Klaus Cerjak:
Larus argentatus / North Sea, Netherlands
Klaus Cerjak:
Larus argentatus / North Sea, Netherlands
Klaus Cerjak:
Larus michahellis / Ibiza, Spain
Klaus Cerjak:
Ichthyaetus audouinii / Ibiza, Spain
Klaus Cerjak:
Ichthyaetus audouinii / Ibiza, Spain
Klaus Cerjak:
Ichthyaetus melanocephalus / Cesenatico, Italia
Klaus Cerjak:
Larus marinus / Texel, Netherlands
Klaus Cerjak:
Chroicocephalus ridibundus / Zadar, Croatia
Klaus Cerjak:
Chroicocephalus genei / Cervia, Italy