Forests comprise 25.4% of the total area of Greece, making it the fourth largest country in Europe with respect to forest resources. The majority of the Greek forests are natural and not technical. They are characterized as Mediterranean. These are ecosystems that have adapted to dry, hot summers and cold winters. Oak trees have developed in the Mediterranean and Circum Mediterranean zone, while acorns grow in the Thessaly plain where the soil is more fertile. We will also come across types of trees that have spread throughout Europe, such as the pine (Pinus silvestris), the spruce (Picea abies), and the beech (Fagus sylvatica).
The fauna in the Greek forests are characterized by high biodiversity. Other than the numerous kinds of birds, reptiles and insects, there is also a remarkable variety of mammals which live in the Greek forests, with the most notable being the brown bear (Ursus arctos), the wildcat (Felis silvestris), the jackal (Canis aureus), the wolf (Canis lupus) and the badger (Meles meles).
Source : http://www.visitgreece.gr/en/nature/forests