15th century. In those days, the darts were carved from beech (fagus) wood and the flights were feathers drawn from the indigenous purple swamphen (named in Italian , 'sultana bird'), famed for its spectacular violet-blue plumage. Environment Following an enormous reforestation plan Sardinia has become the Italian region with the largest forest extension. 1,213,250 hectares (12,132 km2) or 50% of the island is covered by forested areas. The Corpo forestale e di vigilanza ambientale della Regione Sarda is the Sardinian Forestry Corps. Sardinia is one of the regions in Italy which are most affected by forest fires during the summer. The Regional Landscape Plan prohibits new building activities on the coast (except in urban centers), next to forests, lakes or other environmental or cultural sites and the Coastal conservation agency ensures the protection of natural areas on the Sardinian coast. Renewable energies have increased noticeably in recent years, mainly wind power, favoured by the windy climate, but also solar power and biofuel, based on jatropha oil and colza oil. 586.8 megawatts of wind power capacity were installed on the island at the end of 2009. Fauna Sardinia is home to a wide variety of rare or uncommon animals, such as several species of mammals, many of them belonging to an endemic subspecies: the Mediterranean monk seal, Sarcidano horse, Giara horse, albino donkey, Sardinian feral cat, mouflon, Sardinian long-eared bat, Sardinian deer, fallow deer, Sardinian fox (Vulpes vulpes ichnusae), Sardinian hare (Lepus capensis mediterraneus), wild boar (Sus scrofa meridionalis), edible dormouse and European pine marten. Rare amphibians, found only on the island, are the Sardinian brook salamander, brown cave salamander, imperial cave salamander, Monte Albo cave salamander, Supramonte cave salamander and Sarrabus cave salamander (Speleomantes sarrabusensis); the Sardinian tree frog is also found in Corsica and in the Tuscan Archipelago. Among reptiles worthy of note are Bedriaga's rock lizard, the Tyrrhenian wall lizard and Fitzinger's algyroides, endemic species of Sardinia and Corsica. The island is inhabited by terrestrial tortoises and sea turtles like Hermann's tortoise, the spur-thighed tortoise, marginated tortoise (Testudo marginata sarda), Nabeul tortoise, loggerhead sea turtle and green sea turtle. A new arachnid species, endemic to the island, has been recently found: the Nuragic spider. Due to its insularity, in Sardinia there are many species of endemic insects, not present in other parts of the world, such as, for example, the Galeruca sardoa and the Anoxia matutinalis sardoa. Sardinia