to 150 bird species. In December 2018, a group of Dalmatian pelicans landed on the lake, close to the power plant. Their closest habitat is the Danube Delta, and they haven't been spotted in the Đerdap since 1914. The group left soon, but the pelicans returned in January 2019. As the birds were continuously spotted in the nesting periods, survey was conducted in June 2021 to confirm pelicans nesting in the area after more than a century. It was also discovered that the wider park area is inhabited by other rare or previously extinct species. Nesting couples of white-winged tern, already extinct from central Serbia, were spotted just south of the park, while the only second nesting locality of yellow-legged gull in Serbia was discovered just to the north. Nests of these gulls haven't been spotted in Serbia since c.1900. Other spotted birds include European roller, woodchat shrike, booted eagle, common tern and greylag goose. As of the 2020s, there was a stable population of 10 to 12 Eurasian lynx, out of estimated 40 to 60 in the entire Serbia. Human history The national park is dotted with many natural and cultural values which are included in a special protection programme. Lepenski Vir is the 11,500-year-old archaeological site with exceptionally important traces of settlements and the life of the Mesolithic and later Neolithic people. Lepenski Vir was discovered in 1967 by Dragoslav Srejović, but from 1965 to 1971 over 30 sites were discovered ranging from the Mesolithic to the Late Middle Ages. Around 800 BC it was part of the transit route of the Triballi, Dacians ant the Autariates while Romans arrived in the first century BC. Đerdap was part of the border zone of the empire and was on the route of the western extension of the Via Militaris. Some remnants of the road still survive. Roman Emperor Trajan built in 105 AD a famed Trajan's Bridge, from which the several pillars survived today so as the Tabula Traiana. There was also a Roman fortress Diana in Kladovo. Altogether, there are 4 cultural monuments and 19 archaeological finds. Major medieval monument is the Golubac fortress with numerous artifacts discovered in it: pottery, iron tools, hatchets, pickaxes, spears, bolts, etc. In the vicinity of the fortress are the remnants of the Turkish bath and the memorial drinking fountain dedicated to Zawisza the Black, Polish knight who was killed defending the