For the first project in my Industrial Design course, I had to create a live catch mouse trap. The model had to be crafted out of illustration board, but if it were manufactured it be made from flat plastic. No glue was used, except for the mechanism, and it doesn't harm the mouse in any way.
Ideally, the mouse would run up the ramp and try to eat the food that is placed on the platform which is held up by sensitive magnets. When the mouse places its weight on the platform, it drops down into the chamber below and the suspended roof covers the top.
Here's the model completely disassembled.