Nature Park of Alvão the moist lands along the riverfront. The Olo River is rich in trout and is populated by the Eurasian otter ("Lutra lutra"). Throughout the region, bird populations are diverse and include nesting pairs of Golden eagles. Mammal populations are marked by the presence of Wild boar ("Sus scrofa"), Roe deer ("Capreolus capreolus"), European badger ("Meles meles"), Granada hare ("Lepus granatensis") and European rabbit ("Oryctolagus cuniculus"). Among reptiles in the area are the Iberian emerald lizard ("Lacerta schreiberi") and the Latastei viper ("Vipera latastei"). No less important to the region is the traditional architecture of the nature park region, especially in
River Meles be subject to contradictory views among scholars and other concerned parties. Homer is connected with the valley of Smyrna and the banks of the Meles. His figure was one of the stock types on coins of Smyrna, one class of which showed the poet sitting, holding a volumen on his knees, and supporting his chin on his right hand was called "Homerian" by numismatists. The epithet "Melesigenes" (which means, "son of Meles" was applied to him. The cave where he was to compose his poems was described as being near the source of the river, his temple, the Homereion, stood