Park Neusiedler See-Seewinkel gained international acceptance as an IUCN Category II preserve. In 2001 the national parks in Austria and Fertő-Hanság in Hungary were together accepted as a World Heritage Site. Lake Neusiedl See and its surrounding areas in Austria also enjoy protection through the Ramsar Convention on Wetlands. Mammals Over 40 mammal species have been recorded from the area, including the European ground squirrel, the steppe polecat and the European hamster. Birds In the area over 300 bird species have been recorded. Of these, around 150 breed, representing around 40% of the European and 80% of all Austrian bird species. The area contains one of the largest breeding populations of great egrets, with up to 700 pairs. There are also around 35 pairs of grey heron and 70 pairs of great bustard. One of the best known bird species in the area is the white stork, which is seen as a symbol of the region. Other species present include Eurasian spoonbill, purple heron, eastern imperial eagle, white-tailed eagle, greylag goose, golden oriole, European bee-eater, pied avocet, ruff, Kentish plover, common tern, common redshank, black-tailed godwit, Eurasian curlew, western yellow wagtail, short-eared owl, Montagu's harrier and many others which are of interest to local and visiting birdwatchers. Fish Native fish species include the pike, zander, European carp and wels catfish, alongside numerous minnows, such as stickleback, common bleak, white bream, common bream and ruffe. The European eel is not native to the lake, but was introduced as a food source for humans. Due to environmental concerns, further releases of young eels has been recently banned. The Prussian carp has also been introduced to the lake, alongside the pumpkinseed. Herptiles The European tree frog is a common species in the area. Other amphibians that can be found, especially in the reed belt and the lakeside edge, include common toad, European green toad, common spadefoot, moor frog, agile frog, pool frog, marsh frog, edible frog and the European fire-bellied toad. Danube crested newt and smooth newt are also present. Reptiles are represented by the grass snake and a number of lizard species including the European green lizard, sand lizard and the common lizard. Occasionally, dice snakes may be seen, but the meadow viper, which was previously identified around the lake, has not been seen since 1973. Towns and villages around the lake Traces of human settlement around Lake Neusiedl go back to