Finding that humble abode is not always so easy. ... A mouse nest will look like a 3- to 6-inch pile or roughly shaped ball of paper, string, cardboard, bedding, fabric, and sticks.

Finding a mouse nest is the easiest way to confirm your rodent suspicions. The first place you should look is inside your car's airbox (that's where the engine air filter is located).

A mouse spotted tidying a shed may be building a nest, and enjoying the process, ... "It might be that the mouse is actually finding this rewarding," said Megan Jackson from the University of Bristol.