Almost all species of amphibian and reptile common in Lithuania live in Žemaitija National Park. Amphibians – 9 species, reptile – 6 species. Lithuanian Red Book species: Natterjack Toad (Epidalea calamita), Great Crested Newt (Triturus cristatus), European Pond Turtle (Emys orbicularis).
Common Frog (Rana temporaria), Marsh frog (Rana arvalis), Little Water Frog (Rana lessonae), Edible Frog (Rana esculenta) are some of the most common amphibians in the National park. In the National Park less frequently noticeable reptiles: Slow Worm (Anguis fragilis), poisonous snake Common adder (Vipera berus).