Here is a really funny and useful application in the instructables, that using the Arduino and some simple modules to take a photo of the mouse, which the Author called "roommate" .
This guy lived alone in a small house and there maybe some mouse there. so he use an Arduino compatible board-Crowduino, which have a SD card socket compares to the original arduino board, a PIR sensor and a serial camera to take a monitor the mouse, to see what his "roommate" looks like.
Very lucky， this application seems very successful. maybe we can have a try, not only for mouse! 
Very mice (I'm sorry, I mean, nice). 
Good work.
You mean the mouse ate that whole cheese/ twiggy stick? (not apparent in last photo!)
seems not, the mouse play with the cheese, and eat some of them, and then the cheese fall down from the desk...