 These affect aquatic plants of the Volga Delta, such as "Aldrovanda vesiculosa" and the native "Nelumbo caspica".About 11 plant species are found in the Samur River Delta, including the unique liana forests that date back to the Tertiary period.Reptiles native to the region include spur-thighed tortoise ("Testudo graeca buxtoni") and Horsfield's tortoise.