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a green water frog croaking with visible lateral sound sacs as a close up, rana and or polyphylax esculenta
male tree frog singing on a wood stump ( Hyla arborea )
Close-up of a Natterjack toad (Epidalea or Bufo calamita) croaking in breeding habitat, showing its vocal sac
Do not blow your cheeks up, croaking little water frog in the forest pond. Mostly it is colored grass green and is the smallest water frog type in Germany.
A green frog croaks in a pond, among leaves, inflating vocal sacs in lush wetland

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