The Srebarna Nature Reserve is a freshwater lake near the Danube and extending over 600 hectares. Due to its calm and clean waters and the thick set vegetation enclosing it, nearly 100 bird species have chosen to nest here and breed their young. Some 80 other species migrate and find hospitable refuge in the reserve every winter. Many of those birds are rare or endangered. Among the most interesting ones are the Dalmatian pelican, great egret, night heron, purple heron, glossy ibis and white spoonbill.