Looking for an old school Rat trap.

How: This is the most complex of the "better" mousetraps. The idea is to lure an animal in and then put a bell around its neck. Then when the rat returns to its nest, it will scare away its fellow rats, effectively "exterminating" them.

The breakthrough: Patented in 1908, the design hinges on the idea of rats as "sly and distrustful" enough that a bell would humanely, cheaply, and quickly rid a house of a rat colony through fear alone.