A major pest control company claimed that Chicago has the biggest rat problem in the country in 2013. However, an animal shelter in the city of Chicago has come up with an environmentally friendly way to both solve some of this problem, and give several hard-to-adopt cats a permanent home. The Tree House Humane Society not only has sweet adoptable cats, but also manages hundreds of feral cat colonies containing thousands of feral cats which they trap, neuter and release. Taking care of these cats cost the shelter a lot of money and time, and since Chicago has a severe rat problem, they thought they should put the animals to work as natural pest controllers.

Residents and business owners who want to take part in the problem must be willing to pay about $500 to $600 dollars to set up three cats. The cats aren’t just rounded up from the streets and released into a new area as they would quickly leave. Instead, they are slowly trained to get used to their new surroundings. Most people in the program notice an immediate improvement to the rat problem as soon as the cats arrive. Business owners say that the program costs are worth it because the cats save them money on rat-damaged merchandise which must be disposed. Currently, there is a 30-day waiting period for those who want to get into the program.