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The pine marten is omnivorous, with small mammals forming the major part of its diet, particularly in winter. It feeds on voles (Microtus agrestis) and other rodents, birds such as the treecreeper (Certhia familiaris) and capercaillie chicks (Tetrao urogallus), insects, frogs and carrion .
In the spring and summer porcupines eat buds, flowers, leaves and small twigs. Porcupines do not. hibernate in the winter. In winter the inner bark, or cambium, of trees forms the main part of their diet. They chew through the. outer bark of trees to get to the edible cambium.