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Mating vocalizations of Pelophylax ridibundus from Edirne. (A) Male advertisement call, recorded at 18.2 °C; (B) dorsal and ventral view of a male (SVL 66.5 mm); (C) release call type 1, recorded at 22 °C; (D) release call type 2, recorded at 21.5 °C. Calls are shown as audio spectrograms and oscillograms.
