Finnish forest species. The most common flora in the Central Park includes Equisetum, ferns, Anemone, Lythrum and Orchidaceae. Common mammal species present in Espoo include the European hare and the mountain hare, the raccoon dog, the red squirrel, the elk, the red fox, various bat species, the European badger, as well as the roe deer and the white-tailed deer, which was introduced to Finland in the 1930s as a gift from Finnish American migrants. The Suomenoja Bird Reserve in Finnoo, southern Espoo, is considered to be nationally significant for its bird diversity. Among others, there are endangered moorhens, as well as horned grebes and gadwalls. The most common and audible maritime bird species is the black-headed gull, but the whooper swan is also a common sight in the city's archipelago, where white-tailed eagles can be found as well. The city is home to 73 vulnerable or endangered species, including the Siberian flying squirrel, whose Finnish populations have experienced a steep decline for many decades due to logging. The flying squirrel is considered to be the official animal of Espoo, and the squirrel populations are especially plentiful in the northernmost parts of the city. However, the flying squirrel is also present in some southern areas, including the Central Park, Soukka, Espoon keskus, Tapiola, Laajalahti, Hannusmetsä and Matinkylä. Climate Temperature and rainfall Espoo's location in the northern latitudes between the large continent of Eurasia and the even larger Atlantic Ocean causes rapid changes in the weather in Espoo. The height of the terrain from sea level also has an effect on the climate: most of the people in Espoo live south of Lake Bodom, where the terrain only rises over 50 metres above sea level in a few spots. There are no proper plateaus in northern Espoo either: the terrain rises a bit over 100 metres above sea level at the most. Espoo is located in a hemiboreal zone, also known as the oak zone. The most important factor affecting the environment is the Gulf of Finland, cooling the weather down in summer and warming it up in autumn. The coastal convergence increases rainfall going inward into the mainland. The local climate in Nuuksio is different from the rest of Espoo: the terrain in Nuuksio rises up from almost all directions, which causes a forced rise upwards in air currents, which in turn has an effect on the clouds. The ridge in