A mouse would certainly integrate well! But then I would keep the mouse more friendly, like the raven. A mouse hole on the terrace would be possible, and the mouse only comes out / you only meet at the food (hotdog / cookie) something Lying around the terrace. Lying out should also work! if there were a trap made of the corresponding material (hotdog / cookie) ;-).
The mouse flees immediately as soon as it hears or sees you, it should then sneak up.
The mouse may then drop something, a broken claw, fur or whisker hair.
The claw could become a new knife!? The fur could be suitable as a winter suit when the weather changes!? And the whisker hair could become material for building !?