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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 a good berry season, these latter can form 30% of the marten's food and give a telltale blue colour to the animal's scat. Some food is stored in the summer and autumn for retrieval in the winter. As a mainly nocturnal animal, the pine marten forages at night or dusk, and can roam more than 10 kilometres from its den in search of food.