Over the day, the Hazel mouse is sleeping in one or another shelter, the night she goes to find her food, which consists of nuts, acorns, hard seeds, juicy fruits, berries and buds of trees; prefers, however, to eat hazelnuts, which she artfully opens and empties, without picking them or removing them from the nap. She also seeks thrush berries and is therefore not infrequently caught in thrush snares.