common tree frog Litoria caerulea European european tree frog Hyla arborea calling male, amphibian, courtship display, Middle Elbe Biosphere Reserve, SaxonyAnhalt, Germany, Europe, by Thomas Hinsche Stock Photo - Afloimages
European european tree frog (Hyla arborea) calling male, amphibian, courtship display, Middle Elbe Biosphere Reserve, Saxony-Anhalt, Germany, Europe, by Thomas Hinsche