In the wider area of the National Park there are 12 species of reptiles from two rows: turtles (Chelonia) and the scaly ones (Squamata).
In this area the following species are present too: Algyroides nigropunctatus (brown scaly lizard), Lacerta Horvath (Velebit lizard) and Viper macrops (mountainous Karst Meadow Viper). Reptiles of the National Park are mostly common continental species, among which are present some immediate widespread species like: the eastern meadow lizard (Lacerta agilis bosnica) - endemic
to the Balkan Peninsula and the Bosnian common adder (Vipera berus bosniensis) - endemic to the Balkan Peninsula. Three more species are considered endemic to the park: Velebit lizard (Arheolacerta horvathi) - endemic species from eastern Alps, mountainous Karst Meadow Viper (Vipera (Ursini) macrops) - endemic to the Balkan Peninsula and brown scaly lizard (Algyroides nigropunctatus) which is endemic to the Dinaric karst.
Reptile fauna in the area of the park is not too large and doesn't contains many endemic and rare species. But among them there are some species that are endangered, vulnerable, rare and require specific protective measures. Given the lack of data on state of populations of brown scaly lizard (Algyroides nigropunctatus), it is difficult to talk about the vulnerability of this kind, but the fact isthat the pressure of different human activities affects the reduction of habitats and the amount of food for this species. Velebit lizard (Archeolacerta horvathi) is an endemic species of the eastern Alps and northern Dinarides and the biggest problem in protection of the species is the lack of data on population structure and dynamics.
In the area of the Balkan Peninsula there is a subspecies of meadow lizard (Lacerta agilis BOSNICA) and subspecies of common adder snake (Vipera berus bosniensis) on which there is a very little information. The type of mountain Karst Meadow Viper (Vipera (Ursini) macrops) is endangered by the construction of roads and the overgrown meadows because of the disappearance of traditional livestock.
Reptiles of this area are covered by the protection towards the international conventions and by the criteria of IUCN threat. According to the International Union for Conservation of Nature (IUCN), two species have the status of endangered species and they are: mountain Karst Meadow Viper in the category of endangered species (EN) and the European pond turtle as almost an endangered species (NT).
According to the Convention on the Conservation of European Wildlife and Natural Habitats (Bern Convention) there are 11 (including the expected species) strictly protected species of reptiles: pond turtles, brown scaly lizard, meadow lizard, green lizard, Velebit lizard, wall lizard, smooth snake,
Bjelica (Zamenis longissimus), dice snake, mountain Karst Meadow Viper and viper.
Based on Annex III, another 4 species : blind-worm, viviparous lizard, grass snake and common adder snake, are protected. According to European Union Directive on the protection of natural habitats and of wild fauna and flora (Habitats Directive), Annex II (species whose conservation requires stablishment of special protected areas), also states Tortoise and mountain Karst Meadow Viper. According to Annex IV (species requiring strict protection), of the same directive, 11 species are protected: pond turtle,
brown scaly lizard, meadow lizard, green lizard, Velebit lizard, wall lizard, smooth snake, Bjelica (Zamenis longissimus), dice snake, mountain Karst Meadow Viper and viper.