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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 .
As herbivores (the second step in the food chain, also called primary consumers) they feed on lichens and grasses (the primary producers, or first step in the food chain). Occasionally they will eat a bird or bird egg if it is handy. Arctic fox in white winter pelage (left). Arctic fox in brown summer pelage (right).