Three species of green frogs (Pelophylax esculentus complex) have been identified in the Khoper River Valley. The marsh frog P. ridibundus is the most widespread and found in all the studied localities. The pond frog P. lessonae and edible frog P. esculentus have been recorded only in the floodplain of the Khoper River in the Khoper State Nature Reserve (Novokhopersk district of the Voronezh region) and in the extreme northwest of the Volgograd Region.
