The wood mouse (Apodemus sylvaticus) is a common rodent. It is also known as the long-tailed field mouse, field mouse, common field mouse, and European wood mouse.

Habitat 
Almost entirely nocturnal, field mice burrow extensively, digging a series of chambers and runs. Their usual habitat is woodlands, fields and hedgerows, although they are also found in open grassland.

History 
The geographical isolation and recent glacial history of Shetland have resulted in a depleted mammalian fauna. The field mouse (Apodemus sylvaticus L.), along with the brown rat (Rattus norvegicus Berkenhout) and the house mouse (Mus musculus domesticus Schwartz & Schwartz), are one of only three recorded types of rodent present on the island. Based largely on moprphological studies of epigenetic variations, the source of the original founding population has been attributed to Norway with the most obvious date of introduction being presumed to be around the 9th century AD with the arrival of the Vikings. However, archaeological evidence now suggests that this species was present during the Middle Iron Age (around 200 BC - AD 400), and one theory proposes that Apodemus was in fact introduced from Orkney where a population had existed since at the least the Bronze Age.[3]

Field mouse 
Field mouse is the name for a large group of mice in the UK but the real field mouse is the Long Tailed Field Mouse or wood mouse.

Appearance 
They have a solid brown coat with a white belly as shown in the picture. For their size, they have very large eyes and ears. They grow to roughly 10 cm long and weigh 30 grams when full grown.

Eating habits 
They are omnivorous and eat a range of seeds, worms, berries, small insects and carrion. In deciduous woodland they will eat acorns and sycamore seeds for the winter, buds in spring, insects and seeds in summer and berries and fungi in autumn. However, they will eat their own tail if faced with starvation.

Predators 
They are prey to many animals, including owls and foxes and therefore have a short life, normally living for 6 to 12 months. However, in captivity they can live for over 20 months. They live in any place where it can find food or shelter but traditionally live in hedgerows, forests and grass lands. They make their nests wherever it is warm and there is cover. This means that they will usually nest underground but will nest in other warm environments.

Psychology 
The Field mouse has been proven to be extremely intelligent. If given time, it will think out a strategy before doing something. They have extremely small but sharp claws, which they use to dig into houses to scavenge food. They assess a situation before doing anything. They will judge whether it is too risky, dangerous or useless and they often look out for each other. However, if they are being chased, they will dart undercover or into small nooks and crannies.

References 
1. ^ Goaman, K., Amery, H. (1983). Mysteries & Marvels of the Animal World: pg.15

2. ^ Schlitter & Van der Straeten (2004). Apodemus sylvaticus. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Database entry includes a brief justification of why this species is of least concern

3. ^ Nicholson, R.A., Barber, P., and Bond, J.M. (2005). New Evidence for the Date of Introduction of the House Mouse, Mus musculus domesticus Schwartz & Schwartz, and the Field Mouse, Apodemus sylvaticus (L.) to Shetland. Environmental Archaeology 10 (2): 143-151

Rodents