Sardinia world (22 centenarians/100,000 inhabitants). Sardinia is the first discovered Blue Zone, a demographic and/or geographic area in the world with an oversize concentration of centenarians and supercentenarians. In 2016 there were 50,346 foreign national residents, forming 3% of the total Sardinian population. The most represented nationalities were: Sardinia's most populated cities are Cagliari and Sassari. The Metropolitan City of Cagliari has 431,302 inhabitants, or about ¼ of the population of the entire island. Eurostat has identified in Sardinia two Functional Urban Areas: Cagliari, with 477,000 inhabitants, and Sassari, with 222,000 inhabitants. Sardinia is one of the five Italian autonomous regions,
Sardinia some cases Sardinia is a delimited part of the species range. For example, the subspecies of hooded crow, "Corvus cornix" ssp "cornix" occurs in Sardinia and Corsica, but no further south. Some birds of prey found here are the griffon vulture, common buzzard, golden eagle, long-eared owl, western marsh harrier, peregrine falcon, European honey buzzard, Sardinian goshawk ("Accipiter gentilis arrigonii"), Bonelli's eagle and Eleonora's falcon, whose name comes from Eleonor of Arborea, national heroine of Sardinia, expert in falconry. The hundreds of lagoons and coastal lakes that dot the island are home for many species of wading birds, such as