Many species extinct in most of the European countries can be still found in Estonia. Mammals present in Estonia include the grey wolf, lynx, brown bear, red fox, badger, wild boar, moose, red deer, roe deer, beaver, otter, grey seal, and ringed seal. The critically endangered European mink has been successfully reintroduced to the island of Hiiumaa, and the rare Siberian flying squirrel is present in east Estonia. Introduced species, such as the sika deer, raccoon dog and muskrat, can now be found throughout the country. Over 300 bird species have been found in Estonia, including the white-tailed eagle, lesser spotted eagle, golden eagle, western capercaillie, black and white stork, numerous species of owls, waders, geese and many others. The barn swallow is the national bird of Estonia.