Portugal as a whole is an important stopover for migratory bird species: the marshes of the eastern Algarve (Ria Formosa, Castro Marim) and the Lisbon Region (Tagus Estuary, Sado Estuary) hosting various aquatic bird species, the Bonelli's eagle and Egyptian vulture on the valleys of the Douro International, the black stork and griffon vulture on the Tagus International, the seabird sanctuaries of the Savage Islands and Berlengas and the highlands of Madeira and São Miguel all represent the great diversity of wild avian species (around 450 in continental Portugal), not only migratory but also endemic (e.g. trocaz pigeon, Azores bullfinch) or exotic (crested myna, pin-tailed whydah).