Nel meets the rat catchers
18 April 2014 Last updated at 07:15 BST
With reports that rats are getting bigger and are being seen more often in our towns and cities, it's the job of pest controllers to try and catch the rodents.
Nel's been out and about with two of them to see how they do their jobs and how they try to make sure other animals aren't harmed in the process.
Take a look at Nel's interview...