The weight of the field mouse can reach up to 40 g. The head-body length ranges from 60 mm to 110 mm, and the tail can grow up to 40 mm long. The fur on the upper part of the body is yellowish to brown, while the underside is whitish-gray. This species inhabits fields, meadows, and gardens. The mating season begins in March and lasts until October, with litter sizes varying between 2 and 12 offspring. Mating can occur multiple times a year. Microtus arvicolis builds its nests underground, in chambers connected by underground tunnels. These tunnels can reach depths of up to 50 cm. These animals are active both during the day and at night (Wenk 2007).

Diet: The field mouse has a strictly plant-based diet. Its food sources include roots, grasses, herbs, field crops, grains, and clover. Food reserves are stored throughout the year (Wenk 2007).

Conservation status: Both globally and in Germany, Microtus arvalis is classified as “least concern.”