Question: what to do if you have rats in your backyard?
Answer: RECRUIT OWLS TO EAT THE RATS. Owls, and other birds of prey, are natural rat eradicators. ... 
USE TRAPS. Baiting traps to lure and kill rats is something most folks are familiar with. ... 
USE SMOKE BOMBS. ... 
USE DRY ICE. ... 
POLICE YOUR OWN YARD.