Field Mouse (apodemus sylvaticus)

 The term "field mouse" generally refers to several species of small rodents within the genus apodemus. These mice are commonly found in fields and rural areas, although they can occasionally invade human homes and structures. Known for their adaptability and agility, field mice are an important part of many ecosystems.

Field mice are small rodents, typically measuring 8 to 10 centimetres (3 to 4 inches) in body length, with tails that add another 7 to 9 centimetres (2.8 to 3.5 inches). They usually weigh between 13 to 27 grams (0.5 to 1 ounce). Their fur is generally brown or grey with a lighter underbelly, helping them blend into their natural surroundings. They have large ears, a pointed snout, and prominent eyes, giving them a distinct appearance.

Field mice are primarily nocturnal, displaying peak activity at night. They are omnivorous, with a diet that includes seeds, fruits, insects, and small invertebrates. Their foraging habits can significantly impact seed dispersal and pest control in their habitats.

These mice are skilled climbers and burrowers. They often create intricate burrow systems that serve as nesting sites and provide protection from predators. In colder climates, they may enter a state of torpor during extreme winter conditions to conserve energy.

Field mice have a high reproductive rate, which helps maintain their populations despite predation and environmental challenges. Breeding typically occurs from spring through autumn, with females capable of producing multiple litters per year. Each litter can contain 3 to 8 pups, which mature quickly and are ready to reproduce within a few months.

Field mice are generally more of a concern in agricultural and rural areas, where they can cause damage to crops and stored food supplies. They can occasionally invade homes and other buildings, particularly in search of food and shelter during colder months. While they can be a nuisance, they also play a beneficial role in natural pest control and seed dispersion.

Field mice are highly adaptable and can thrive in a variety of habitats, including fields, forests, grasslands, and gardens. They prefer areas with dense vegetation or ground cover, which provide protection and food sources. Their burrows are typically located in sheltered spots, such as under rocks, logs, or dense shrubbery.