Although most of its original flora has been obliterated by urbanization, the District has long been known for its beautiful parks, where about 1,800 varieties of flowering plants and 250 shrubs grow. Boulevards are shaded by stately sycamores, pin and red oaks, American lindens, and black walnut trees. Famous among the introduced species are the Japanese cherry trees around the Tidal Basin. Magnolia, dogwood, and gingko are also characteristic. The District's fauna is less exotic, with squirrels, cottontails, English sparrows, and starlings predominating. Two species (Hay's Spring amphipod and the puma) were listed as endangered and one (the bald eagle) as threatened by the US Fish and Wildlife Service as of August 2003.