Sardinia is home to a wide variety of rare or uncommon animals and native plants and animals, such as a few species of mammals: the Mediterranean Monk Seal, the Giara Horse, the Albino Donkey the Mouflon, the Sardinian long-eared bat, the Sardinian Deer, the Sardinian fox, and the wild boar. Found only in Sardinia, the Sardinian skink (Chalcides ocellatus), known more commonly as the tiligugu, can reach 30 cm (12 in) in length, of which almost half consists of the tail. Conversely, Sardinia lacks many common species such as the viper and the marmot, which are found everywhere else on the European continent. The island has also long been used for grazing flocks of indigenous Sardinian sheep. Sardinia has four endemic subspecies of birds found nowhere else in the world: its Great Spotted Woodpecker (ssp harterti), Great Tit (ssp ecki), Chaffing (ssp sarda), and Eurasian Jay (ssp ichnusae).