single edible frog on water surface of wetlands by the biebrza river in poland during a spring mating period

poland biebrzanski biebrza park amphibian reserve color colorful travel tourism outdoor nature living wildlife wild green wetland wetlands moor marsh marshes swamp swamps natural conservation portrait water pond reiver lake surface swim edible frog common european rana esculenta zaba zielona wodna one single alone wet plaz