The two main species that can cause a problem throughout Hertfordshire and the rest of the UK are the house mouse (Mus domesticus) and the field mouse (Apodemus slvaticus). The field mouse however doesn’t usually enter  inhabited buildings and is more likely to be found in sheds and other outbuildings.

Mice will eat almost any type of food source they can find. Field mice will tend to eat seeds, berries, insects and even some fruit such as apples whilst house mice prefer seeds and grain and are particular fond of cereals.

The house mouse as its name suggests likes to live in the house, staying close to humans and its food source it will find quiet places such as inside the insulation of walls or ceilings, in and behind cupboards, work tops etc. The house mouse will construct nests from various soft materials that are available like cloth and cardboard.
The field doesn’t like to live in inhabited areas and so is more likely to be found in sheds, outbuildings etc and so is more likely to be an agricultural pest rather than a domestic pest.

You might discover you have a mouse problem when you notice droppings around food sources, hear scratching sounds and/or see signs of gnawing, and perhaps even see signs of nesting.

You might find field mouse entering sheds, barns or outbuildings in the winter months when it starts to get cold but with house mice they remain active all year round so you could find yourself with a mouse infestation at any time in the year.